1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

rear disc conversion

Discussion in '2nd Gen. Tacomas (2005-2015)' started by trailhoor, Sep 22, 2010.

  1. Sep 22, 2010 at 8:03 AM
    #1
    trailhoor

    trailhoor [OP] Well-Known Member

    Joined:
    Dec 21, 2009
    Member:
    #27962
    Messages:
    78
    Gender:
    Male
    Colorado
    Vehicle:
    08 BLK TRD
    King Adj Remote C/Os, Icon UCAs, King Adj Remote Rears, Alcan Leafs, Light Racing Jounce Shocks, Defined Engineering Shackles, Defined Engineering X-brace, Hakkapelittas (winter), Tunes, TRD S/C, APR X-1, URD 2.825 pulley, AFE Stage II, Doug Thorley LT, All Pro Rear Plate Bumper, Tom Woods CV drive shaft, FX-R HID headlights, diff lock, door chime, fogs anytime, bright reverse lights, map lights wired to door lights, defrost A/C, bed bike mounts
    So I'm now convinced my rear drums need to be converted to discs. I've upgraded my lines all the way around to stainless, and put aftermarket Hawk pads in the front and noticed a nice improvement in feel and power. But the rear drums are real grabby and I don't like the way they feel. I did some research a while back and came across this product from Tundra Racing.com

    http://www.sosperf.com/tundra%20_double_stnd_brake.htm

    Does anyone have experience with this rear disc conversion?
    Does anyone have experience with another kit?
     
  2. Sep 22, 2010 at 8:09 AM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,160
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    The rear disk conversion gives reduced stopping power. TO get the full benafit (If any) from rear disk brakes, you would need to also change the brake booster, and master cyl.
     
  3. Sep 23, 2010 at 7:54 AM
    #3
    trailhoor

    trailhoor [OP] Well-Known Member

    Joined:
    Dec 21, 2009
    Member:
    #27962
    Messages:
    78
    Gender:
    Male
    Colorado
    Vehicle:
    08 BLK TRD
    King Adj Remote C/Os, Icon UCAs, King Adj Remote Rears, Alcan Leafs, Light Racing Jounce Shocks, Defined Engineering Shackles, Defined Engineering X-brace, Hakkapelittas (winter), Tunes, TRD S/C, APR X-1, URD 2.825 pulley, AFE Stage II, Doug Thorley LT, All Pro Rear Plate Bumper, Tom Woods CV drive shaft, FX-R HID headlights, diff lock, door chime, fogs anytime, bright reverse lights, map lights wired to door lights, defrost A/C, bed bike mounts
    I've talked to these guys. The system was designed to work with the OE master cylinder and booster. They have sold 400 kits. I'm trying to find someone who has installed one and has experience with this kit or another rear disc conversion. I'm not looking for all the possible issues with blindly installing rear discs- obviously some engineering is required.
     
  4. Sep 23, 2010 at 8:04 AM
    #4
    white91formula

    white91formula Well-Known Member

    Joined:
    Jan 25, 2009
    Member:
    #12973
    Messages:
    601
    Gender:
    Male
    Boston, MA
    Vehicle:
    05 6speed TRD OR

    all you should have to change is the proportioning valve, the rest of it should all be the same
     
  5. Sep 23, 2010 at 8:08 AM
    #5
    Jigzor

    Jigzor Well-Known Member

    Joined:
    May 19, 2009
    Member:
    #17413
    Messages:
    3,077
    Gender:
    Male
    Pennsylvania
    Vehicle:
    17 DCSB Silver Sky

    I could have sworn there was a member that confirmed this..
     
  6. Sep 23, 2010 at 8:21 AM
    #6
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,160
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    MJP2 is one person I can think of.
     
  7. Sep 23, 2010 at 8:23 AM
    #7
    USMC Mex

    USMC Mex Active Member

    Joined:
    Feb 21, 2010
    Member:
    #31813
    Messages:
    30
    Gender:
    Male
    Sun City, CA
    Vehicle:
    10 PreRunner TRD
    Just gettin started!
    X2
     
  8. Sep 23, 2010 at 8:24 AM
    #8
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,160
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    Send a PM to MJP2, IIRC, He is running that set up.
     
  9. Sep 23, 2010 at 8:45 AM
    #9
    8th sin

    8th sin Swollen Member

    Joined:
    Dec 7, 2008
    Member:
    #11357
    Messages:
    511
    Gender:
    Male
    Tampa, FL
    Vehicle:
    2015 DCLB 4x4 Sport
    Llumar CTX Tint, Grillcraft MX Upper, Pro Comp Rockwell 5034 17x8.5, Nitto Terra Grappler G2 LT285/70/17, Icon Stage III
    With so little weight in the rear, are discs really necessary? You're talking about a lot of money to roll the dice...I don't think you'll get out of it what you're expecting, but that's just my two cents.

    Drum brakes are like leaf springs...antiquated technology yes, but they have their benefits and get the job done
     
  10. Sep 23, 2010 at 10:05 AM
    #10
    Janster

    Janster Old & Forgetful

    Joined:
    Mar 25, 2007
    Member:
    #1138
    Messages:
    14,256
    Gender:
    Female
    First Name:
    Jandy
    Lancaster, PA
    Vehicle:
    2016 GMC Canyon SLT w/ LineX and....
    Personally, I wouldn't mess with the brakes. YOu have a perfectly good truck with perfectly good brakes that are designed and engineered to work with your ABS system & such. And if you had an 09 with the Auto LSD, VSC and all that other technical stuff - changing the rear brakes could effect how all those other systems work. And not to mention, you need an ebrake also.

    http://www.4wheeloffroad.com/techarticles/drivetrain/131_0708_4x4_disc_brakes/index.html

    The disc/drum setups are different for a variety of reasons. Without researching exactly how the system works - you're braking system is not going to work properly.

    I spent weeks & weeks researching disc conversions for my Jeep (trail rig). I changed the master cylinder & proportioning valve. The system wasn't perfect but it was 100% better than the original one (I swapped to bigger axles). The kicker here.....the jeep was not my daily driver and I only drove it a few times a month. With a daily driver.... and you want to convert to discs, I'd make damn sure its done RIGHT or your life could depend on it.
     
  11. Sep 23, 2010 at 10:27 AM
    #11
    mjp2

    mjp2 Living vicariously though myself Moderator

    Joined:
    Feb 16, 2007
    Member:
    #924
    Messages:
    17,777
    Gender:
    Male
    First Name:
    Milton Juevos Portimous II
    NJ
    Vehicle:
    '06 TRD Access Cab, v6, 6-speed
    Scaffolding and a painted grill
    I'm going to be blunt about this because I've covered it many, many times on this site.

    DO NOT INSTALL THIS KIT.

    Stopping power is reduced horrifically and it will eat your shocks. The driver's side caliper rubs the hell out of the shock when the suspension articulates, and for good measure it pushes the shock into the leaf spring so you'll have matching holes on both sides of the shock body. At least they're thorough.

    [​IMG]

    [​IMG]

    In step with all the other threads on this topic, feel free to argue in favor of the kit based on what the manufacturer tells you.

    As for things working with the stock master cylinder and booster, drum brakes require less fluid and more pressure relative to discs, which require more fluid and less pressure. No rear disc brake conversion can make the stock master cylinder push more fluid through the lines. Period.

    Replace you rear brake shoes, keep them adjusted, and be happy that things work they way they're supposed to.
     
  12. Sep 23, 2010 at 10:30 AM
    #12
    mjp2

    mjp2 Living vicariously though myself Moderator

    Joined:
    Feb 16, 2007
    Member:
    #924
    Messages:
    17,777
    Gender:
    Male
    First Name:
    Milton Juevos Portimous II
    NJ
    Vehicle:
    '06 TRD Access Cab, v6, 6-speed
    Scaffolding and a painted grill
    Discs need more fluid than drums. A proportioning valve is not going to increase the output volume of the stock master cylinder.
     
  13. Sep 23, 2010 at 12:00 PM
    #13
    Brunes

    Brunes abides.

    Joined:
    May 31, 2008
    Member:
    #7011
    Messages:
    17,641
    Gender:
    Male
    First Name:
    Rotorhead
    DC or New Jersey - Depends on the day....
    Vehicle:
    08 Red/Graphite and Satin Black
    Inside: Tint, Wet Okole 1/2 Piped Red/Black Covers, Black Weathertech Digital Fit Mats, URD Short Throw w/ TWM Weighted Knob, USA Spec iPod adapter. Outside: 4300K Retro w/ Angel Eyes and Red Shrouds, 5000K Blazer Fog Light Retrofit, Debadge, Bed Locking Handle, Satin Black Rims Performance: TRD/Steigmeier Blower w/ 2.7 Pulley. 668 Injectors and 320 LPH AEM Fuel pump. URD UCON and 7th Injector. DTLT Headers, URD Y-Pipe, Wicked Flow Muffler. Suspension: Both: OME Shocks Front: 886X's and TC UCAs Rear: Dakars Armor: Relentless Front Bumper Relentless High Clearance Rear w/ Tire/Rotopax Swing Out Relentless Front, Mid, and TCase skids BAMF Diff Skid Recovery and Spares: Fullsize Spare Tire 2x2 gal Rotopax 1x1 gal Rotopax 1x1 gal Water Rotopax Warn 9.5XP-S Winch Hi-Lift Extreme 60" Ironman Off-Road Recovery Kit
    400 kits....for a truck that has sold several hundered thousand units...That's not so great sounding if you ask me.

    And X2 to anything MJP2 says (for now...)
     
  14. Sep 23, 2010 at 12:05 PM
    #14
    Jigzor

    Jigzor Well-Known Member

    Joined:
    May 19, 2009
    Member:
    #17413
    Messages:
    3,077
    Gender:
    Male
    Pennsylvania
    Vehicle:
    17 DCSB Silver Sky
    Very true. If he ever recommends a certain brand of jack stands I will go buy 2 sets!!:p
     
  15. Sep 23, 2010 at 12:07 PM
    #15
    Brunes

    Brunes abides.

    Joined:
    May 31, 2008
    Member:
    #7011
    Messages:
    17,641
    Gender:
    Male
    First Name:
    Rotorhead
    DC or New Jersey - Depends on the day....
    Vehicle:
    08 Red/Graphite and Satin Black
    Inside: Tint, Wet Okole 1/2 Piped Red/Black Covers, Black Weathertech Digital Fit Mats, URD Short Throw w/ TWM Weighted Knob, USA Spec iPod adapter. Outside: 4300K Retro w/ Angel Eyes and Red Shrouds, 5000K Blazer Fog Light Retrofit, Debadge, Bed Locking Handle, Satin Black Rims Performance: TRD/Steigmeier Blower w/ 2.7 Pulley. 668 Injectors and 320 LPH AEM Fuel pump. URD UCON and 7th Injector. DTLT Headers, URD Y-Pipe, Wicked Flow Muffler. Suspension: Both: OME Shocks Front: 886X's and TC UCAs Rear: Dakars Armor: Relentless Front Bumper Relentless High Clearance Rear w/ Tire/Rotopax Swing Out Relentless Front, Mid, and TCase skids BAMF Diff Skid Recovery and Spares: Fullsize Spare Tire 2x2 gal Rotopax 1x1 gal Rotopax 1x1 gal Water Rotopax Warn 9.5XP-S Winch Hi-Lift Extreme 60" Ironman Off-Road Recovery Kit
    and some stock in that company....He'es going to keep them in business for a long time....
     
  16. Sep 23, 2010 at 12:09 PM
    #16
    mjp2

    mjp2 Living vicariously though myself Moderator

    Joined:
    Feb 16, 2007
    Member:
    #924
    Messages:
    17,777
    Gender:
    Male
    First Name:
    Milton Juevos Portimous II
    NJ
    Vehicle:
    '06 TRD Access Cab, v6, 6-speed
    Scaffolding and a painted grill
  17. Sep 23, 2010 at 1:14 PM
    #17
    Capita

    Capita Well-Known Member

    Joined:
    Jun 6, 2009
    Member:
    #18096
    Messages:
    2,673
    Gender:
    Male
    Corner Brook, Newfoundland, Canada
    Vehicle:
    09 TRD Sport Double Cab
    I'd keep the rear drums anyday over disks
     
  18. Sep 23, 2010 at 1:19 PM
    #18
    nad

    nad mmmm tacos!

    Joined:
    May 18, 2009
    Member:
    #17388
    Messages:
    3,075
    Gender:
    Male
    First Name:
    Jordan
    Canada
    Vehicle:
    2014 Sierra All Terrain
    ya me too, I have had rear discs on cars before and they were nothing but problems, calipers were always locking up.
     
  19. Sep 23, 2010 at 1:21 PM
    #19
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,160
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    The Tacoma has the best stopping power in its class. The other truck/s have disk rear (cept the Dakota, but anything short of a block wall has a hard time stopping it).
     
  20. Sep 23, 2010 at 2:10 PM
    #20
    trailhoor

    trailhoor [OP] Well-Known Member

    Joined:
    Dec 21, 2009
    Member:
    #27962
    Messages:
    78
    Gender:
    Male
    Colorado
    Vehicle:
    08 BLK TRD
    King Adj Remote C/Os, Icon UCAs, King Adj Remote Rears, Alcan Leafs, Light Racing Jounce Shocks, Defined Engineering Shackles, Defined Engineering X-brace, Hakkapelittas (winter), Tunes, TRD S/C, APR X-1, URD 2.825 pulley, AFE Stage II, Doug Thorley LT, All Pro Rear Plate Bumper, Tom Woods CV drive shaft, FX-R HID headlights, diff lock, door chime, fogs anytime, bright reverse lights, map lights wired to door lights, defrost A/C, bed bike mounts
    Thanks for the info guys. To answer some of your questions:

    The stock Tacoma (mine's an '08) brakes suck. When I upgraded my lines to stainless and pads- I experienced a solid improvement in pedal feel and stopping power. If you're happy with your stock brakes- great, I'm not. My brakes are the weak link with all the engine and suspension upgrades.

    I believe the rear drums are grabby compared to the front because last week one of my rear brakes was squealing just driving along after some off roading. I removed the drum and washed out the brake with water- noise gone. I then decided backing up and applying the brakes might help adjust them (I'm not actually sure if our trucks have this feature). After that, my brakes feel very grabby. This is a known characteristic of drum brakes.

    Second gen Tacomas do not have a weight adjusting proportioning valve to my knowledge. Is there another proportioning valve after the master cylinder?

    If the rear brakes don't do any work, than how can the truck's stopping power be "horrifically" reduced? Obviously the front brakes do most (maybe 75%) of the braking work, but if the rears have a grabby feel, then there goes my sweet smooth powerful feel.

    MJP2: So you installed and used this kit and it interferes with the shock- thanks! That's what I want to know. Nuff said, this kit is shit based soley on that issue. Can you elaborate on the match of the discs to the OE master cylinder- not even close? Perfect? Sounds like your stopping power was shit after this install? Great- that's what I want to know. F%&k this kit and thanks for the info.

    Anyone know of better shoes for our stock drums? Anyone know how to 'properly' adjust the drums?
     
To Top