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
    Quick Links: 2000 Radio install Rancho Quick Lift Install - Help Prerunner wheel bearings New Leafs - Creeking Noise! What floor jack height is needed What have you towed with a 4 cylinder??

Vacuum Leak Back of Brake Master Cylinder

Discussion in '1st Gen. Tacomas (1995-2004)' started by License2Ill, Nov 16, 2019.

  1. Nov 16, 2019 at 12:04 PM
    #1
    License2Ill

    #1
    License2Ill [OP] Woke like a Coma Toyota Tacoma

    Joined:
    May 20, 2012
    Member:
    #79174
    Messages:
    2,253
    Gender:
    Male
    First Name:
    Ian
    It's a dry heat thou, AZ
    Vehicle:
    2004 SC'd 5VZ DC 5spd 4x4 TRD.GOV
    Bailing wire & Duct tape
    The FSM isn't clear. And my searching hasn't yielded any luck.

    But I have a vacuum leak between the brake booster & Master Cylinder. Directly between the two. I'm showing +15-16% LTFT at idle with it dropping to +7-8% over 2000rpm.


    Is there a gasket between this mating surface? Or an O-ring within the internal shaft coupling the MM to the BB? Anyone aware if this gasket/O-ring's is replaceable & if so, does anyone know what the p/n is?

    Thanks in advance for any help here.
     
    License2Ill, Nov 16, 2019
    #1
  2. Nov 16, 2019 at 12:12 PM
    #2
    CS_AR

    #2
    CS_AR Well-Known Member

    Joined:
    Apr 3, 2019
    Member:
    #289019
    Messages:
    12,913
    Gender:
    Male
    Vehicle:
    1999 Tacoma PreRunner TRD
    Everything but the driveshaft. B03A - 410
    CS_AR, Nov 16, 2019
    #2
    1997tacomav6 and License2Ill[OP] like this.
  3. Nov 16, 2019 at 12:15 PM
    #3
    Bishop84

    #3
    Bishop84 Well-Known Member

    Joined:
    Dec 17, 2015
    Member:
    #172494
    Messages:
    12,021
    Gender:
    Male
    Yes there is an o-ring.
     
    Bishop84, Nov 16, 2019
    #3
    License2Ill[OP] likes this.
  4. Nov 16, 2019 at 12:21 PM
    #4
    License2Ill

    #4
    License2Ill [OP] Woke like a Coma Toyota Tacoma

    Joined:
    May 20, 2012
    Member:
    #79174
    Messages:
    2,253
    Gender:
    Male
    First Name:
    Ian
    It's a dry heat thou, AZ
    Vehicle:
    2004 SC'd 5VZ DC 5spd 4x4 TRD.GOV
    Bailing wire & Duct tape
    Okay. That's good to know. Is that something I can grab from the dealership?
     
    License2Ill, Nov 16, 2019
    #4
  5. Nov 16, 2019 at 12:26 PM
    #5
    Bishop84

    #5
    Bishop84 Well-Known Member

    Joined:
    Dec 17, 2015
    Member:
    #172494
    Messages:
    12,021
    Gender:
    Male
    I've never seen it seperate from the MC. So I'm not sure, and Toyota Orings are hard to match up with universal kits.

    Also I've heard of the booster rusting out due to moisture and leaking vacuum.
     
    Bishop84, Nov 16, 2019
    #5
  6. Nov 16, 2019 at 12:28 PM
    #6
    License2Ill

    #6
    License2Ill [OP] Woke like a Coma Toyota Tacoma

    Joined:
    May 20, 2012
    Member:
    #79174
    Messages:
    2,253
    Gender:
    Male
    First Name:
    Ian
    It's a dry heat thou, AZ
    Vehicle:
    2004 SC'd 5VZ DC 5spd 4x4 TRD.GOV
    Bailing wire & Duct tape
    @mechanicjon

    I found a post you made a few years ago.
    You know the part number for the vacuum gasket?
     
    License2Ill, Nov 16, 2019
    #6
  7. Nov 16, 2019 at 12:30 PM
    #7
    License2Ill

    #7
    License2Ill [OP] Woke like a Coma Toyota Tacoma

    Joined:
    May 20, 2012
    Member:
    #79174
    Messages:
    2,253
    Gender:
    Male
    First Name:
    Ian
    It's a dry heat thou, AZ
    Vehicle:
    2004 SC'd 5VZ DC 5spd 4x4 TRD.GOV
    Bailing wire & Duct tape
    Okay. Not much rust anywhere on my truck.

    It's definitely coming from behind the paper gasket between the where the MS bolts to the booster...
     
    License2Ill, Nov 16, 2019
    #7
  8. Nov 16, 2019 at 12:31 PM
    #8
    License2Ill

    #8
    License2Ill [OP] Woke like a Coma Toyota Tacoma

    Joined:
    May 20, 2012
    Member:
    #79174
    Messages:
    2,253
    Gender:
    Male
    First Name:
    Ian
    It's a dry heat thou, AZ
    Vehicle:
    2004 SC'd 5VZ DC 5spd 4x4 TRD.GOV
    Bailing wire & Duct tape
    They sell this/ seal for most other Toyotas. Can't find it for my 04 though.
     
    License2Ill, Nov 16, 2019
    #8
  9. Nov 16, 2019 at 2:55 PM
    #9
    1997tacomav6

    #9
    1997tacomav6 V6 5sp,RegCab,TVS1320 Supercharger,Haltech, 800k

    Joined:
    Oct 5, 2013
    Member:
    #113940
    Messages:
    10,393
    Gender:
    Male
    First Name:
    John
    Denver
    Vehicle:
    97 reg cab, v6 5sp 300hp supercharged, Methonal Injection, 800,001 plus miles, Original Owner
    V6 5sp,RegCab,TVS1320 Supercharger, 56mm pulley, methanol injected Haltech ECU, AC Tvs1320 supercharger,(MUST DO) every 125,000- 150,000 needs rebuild Projector headlights HID 5 speed manual Amsoil for all drive train Smaller 56mm custom pulley, (MUST DO) 2004 DESNO fuel injectors, zero ping ping, 2004 side door mirrors Dick Cepek Rims, Michelin tires LTX, ATM Pathfinders Dynopro ATM ( that last 100,000 miles) Now running Dynopro ATM mud and snow tires KN cold air intake Cat back dual exhaust with ss exhaust tip, Raised exhaust tail pipe to 2" below body line Optima*dry cell battery,red top Alpine sirius radio, 200 watt amp, focal is165 split door pod speakers Focal door speakers Subwoffer behind seat Viper alarm, Electric Locks Dark tinted windows, bucket seats corbeau lg1 Tacoma Rubber floor mats TRD fender extenders, Bilstien shocks, King shocks JBA UCA trailer iv hitch, electric brake control, Drilled slotted brakes, High carbon steel (MUST DO) EBS green stuff 7000 series pads(MUST DO) TRD engine oil cap TRD stick shift, Marlin crawl shift kit. Rear sliding window 2002 4Runner functional hood scoop cut into Tacoma hood, 4Runner dual overhead map light Gentex Auto dim + Compass + Temp, garage,rearview mirror Snow Methonal kit stage 2 Custom 3 core aluminum radiator Linex bed liner Haltech stand alone ECU, Intake supercharger gauge. Stainless steel brake lines, Custom leather wrapped steering wheel, Haltech stand-alone ECU,
    Any vacuum leak will play havoc with your fuel trims.
     
    1997tacomav6, Nov 16, 2019
    #9
  10. Nov 16, 2019 at 6:50 PM
    #10
    License2Ill

    #10
    License2Ill [OP] Woke like a Coma Toyota Tacoma

    Joined:
    May 20, 2012
    Member:
    #79174
    Messages:
    2,253
    Gender:
    Male
    First Name:
    Ian
    It's a dry heat thou, AZ
    Vehicle:
    2004 SC'd 5VZ DC 5spd 4x4 TRD.GOV
    Bailing wire & Duct tape
    I've noticed. :)

    Is this seal/ gasket/ O-ring replaceable, And sold aside from replacing the complete Master Cylinder? Anyone know?
     
    License2Ill, Nov 16, 2019
    #10
  11. Nov 16, 2019 at 9:19 PM
    #11
    Glamisman

    #11
    Glamisman Well-Known Member

    Joined:
    Oct 22, 2016
    Member:
    #200436
    Messages:
    4,971
    Gender:
    Male
    This probably what you are inquiring about... I have never seen it sold separately but I haven't searched everywhere.

    IMG_0177.jpg
     
    Glamisman, Nov 16, 2019
    #11
    License2Ill[OP] likes this.
  12. Nov 17, 2019 at 9:21 AM
    #12
    License2Ill

    #12
    License2Ill [OP] Woke like a Coma Toyota Tacoma

    Joined:
    May 20, 2012
    Member:
    #79174
    Messages:
    2,253
    Gender:
    Male
    First Name:
    Ian
    It's a dry heat thou, AZ
    Vehicle:
    2004 SC'd 5VZ DC 5spd 4x4 TRD.GOV
    Bailing wire & Duct tape
    Yep. I searched high and low. Nahdah.
     
    License2Ill, Nov 17, 2019
    #12

Products Discussed in

Mobil 1 104361 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)
$27.88
Air Intake Snorkel Kit Fit For 2005-2015 Toyota Tacoma With 4L Right Petrol intake air snorkel kit high performance system compatible kit Replacement black Rotational Molding (2005-2015)
$73.00
NOCO Boost GB40: 1000A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables - for 6.0L Gas and 3.0L Diesel Engines
$91.21
M6 Black Acorn Cap Nuts, Stainless Steel 304 (18-8) Black Coating Acorn Nuts, 20Pcs-Pack
$8.49
Magnefine 3/8" Magnetic Inline Transmission/Power Steering Filter
$25.95
Aisin VST-001 Bulk Vacuum Switch Valve - Green
$36.04
HitchHammer Bumper Guard (HitchHammer 11.5" Wide)
$59.95
Rexka 12pcs Transfer & Differential Service Gasket Kit Compatible with Toyota Lexus 4Runner Land Cruiser Tundra Tacoma FJ Cruiser Highlander RAV4 Sequoia Sienna 1215710010 9043024003 90430A0003
$5.99
Veepeak OBDCheck BLE Bluetooth OBD II Scanner Car Check Engine Light Code Reader, Auto Dual Mode Bluetooth Diagnostic Scan Tool for iOS & Android
$31.98
OEMTOOLS No-Spill Coolant Funnel Kit, 15 Piece Fluid and Oil Funnel Set, Allows Access To Hard-To-Reach Radiators
$24.99
Ford Genuine Fluid XT-M5-QS Full Synthetic Manual Transmission Fluid - 1 Quart, Black
$32.58
Spicer 5-1330X U-Joint Kit 1330/SPL25 Series (OSR)
$27.95
Mobil Synthetic, SAE Grade : 75W-90, 1 gal. Jug 122035-1 Each
$49.90
PRIMEWELD CUT60 60Amp Non-Touch Pilot Arc PT60 Torch Plasma Cutter 110V/220V Dual Voltage 3 Year Warranty
$699.00
ATP Automotive AT-205 Re-Seal Stops Leaks, 8 Ounce Bottle
$21.11
iCrimp Open Barrel Terminal Crimping Tool for Molex Style DELPHI AMP TYCO Deutsch Terminals Crimper, Molex Crimping Tool,24-14 AWG
$17.98
ARB RD129 Air Locking Differential
$1,109.99
Permatex 25228 The Right Stuff 90 Minute Black Gasket Maker, 3 oz, 1 Count (Pack of 1)
$12.16
Brock Replacement Air Cleaner Box Compatible with 99-04 Tacoma Pickup Truck 6 cyl 1770007060
$105.30
Supreme Suspensions - 1.5"-2" Rear Add-A-Leaf Lift Kit for 1995-2023 Toyota Tacoma - 21.5" Short AAL Set with Isolator Pads and Square Bend U-Bolts
$189.89
SEM 39103 Black Original Flexible Bumper Coater Aerosol - 12 oz.
$23.99
Siless Liner 157 (4 mm) mil 36 sqft Car Sound Deadening Closed Cell Foam & Heat Insulation mat - PE Foam Sound Deadener Material & Heat Barrier
$44.95
RLB-HILON Headlight Clip Compatible with Toyota Tacoma Prerunner & 4WD 1998 1999 2000 Year, for Lower Headlight Panel Retainer Clips, for 53245-04010 2PCS
$13.49
Coobeast Bolt Extractor Set Heavy Duty, 13Pcs Bolt Extractor Kit with 3/8" Adapter, Stripped Lug Nut Remover, Easy Out Bolt Remover Set for Rusted, Rounded, Damaged Nuts Screws
$19.98
Fuel Tank Skid Plate Cover Compatible with 1995.5-2004 Toyota Tacoma 15 and 18 Gallon Tanks Powder Coated Steel Gas Tank Skid Plate
$169.50
Motul 7100 4T 10W-40 Synthetic Oil 4 Liters (104092)
$52.50
Thread Gauge Tool,Portable Screw Pitch Gauge,Bolt Size and Thread Gauge Identifier,Standard Screw Size and Thread Gauge Checker for Engineering Craft and Industrial Management Use
$4.70
WIX Racing Filters Air Filter Panel
$28.50
500Pcs Connector Terminal Pin Wire Harness Pins Automotive Auto Car Electrical Connector Pins Motorcycle ATV 1/1.5/1.8/2.2/2.8/3.5mm
$17.98
Buyers Products 1703349 Black Steel Underbody Truck Box with T-Handle Latch, 14 x 12 x 18", Contractor Toolbox For Organization And Storage, Job Tool Chest
$264.00
INKBIRD Meat Thermometer Wireless, Smart Bluetooth Meat Thermometer, IP67 Waterproof Wireless Meat Probe with Rechargeable Box for Outdoor Grill Smoker BBQ Rotisserie iOS & Android App
$47.99
OTC 5609 Cylinder Leakage Tester Kit , Black
$107.99
55 Deg Imperial+60 Metric Thread Pitch Gauge Measure Screw 58 Pieces. Practical and Attractive
$2.70
Fox 2.0 Performance Coil-Over Front Pair compatible with 2005-2016 Toyota Tacoma
$1,022.09
3M Marine Adhesive Sealant 5200 (06500) Permanent Bonding and Sealing for Boats and RVs Above and Below the Waterline Waterproof Repair, White, 10 fl oz Cartridge
$22.40
Switch Pros SP-9100 8-Switch Panel Power System With Concealed Mounting Hardware
$659.00
50W 6Ohm LED Load Resistors for LED Turn Signal Lights or LED License Plate Lights (Fix Hyper Flash, Warning Cancellor)
$9.99
ATP Automotive B-101 Automatic Transmission Filter Kit
$9.99
uxcell US Plug AC 125V 15A Panel Mount Outlet Power Socket Black
$9.99
Plews 55001 Lubrimatic Fluid Quart Pump, Fits Standard Quart Bottles
$9.99
CRC 05078 Throttle Body and Air-Intake Cleaner - 12 Wt Oz.
$9.99
Allstar Performance ALL76232 Universal Two Wire Connector with 12" Loop
$3.49
To Top