2010 Tacoma TRD 4X4 brake booster

Hello all

It has been some time sense I posted here the Tacoma’s have been treating me well.

The brake boost stopped working on our 2010 Tacoma.

Here is a picture what do I have?


Phil

 

From my understanding, there is no booster. It is all done via the pump and pressure accumulator.

 

Thanks for the reply.

I thought maybe that was the case now all I need is to find out where to get some information about this system.

When you say “pump” what pump you are referring to the power steering is working correctly.

Phil P

 

not the power steering pump. there is a pump built into that unit. it is all part of the abs and traction control system.

 

how do you know it stopped working?


That unit is a self contained electric boosted master cylinder 4 channel abs unit that uses an electric pump to build brake fluid pressure in an accumulator. Found only on the 09+ TRD OR 4x4's and select 05-08 trucks equipped with the optional VSC package.

 

Hi

This unit has now failed.

The Toyota dealer tells me the power steering pump supplies the pressure for this system. At least they know it exists.

However the aftermarket people have absolutely no information on any brake system other than the vacuum booster system.

So before I purchase a $350 power steering pump to try and get this working I need some printed technical data that describes the system and how it works.

Thanks in advance.

 

That’s a TRD off road with the magic brakes. Probably not going to be cheap.

 

Forget the PS pump for now. For one thing the OEM pump has now been discontinued and is showing NLA, but that is a different issue I have mentioned in a few other posts...

Anyway now to the PS pump and brake controller. You are showing the hydraulic brake controller. It is used on the TRD off road model as opposed to the vacuum control unit used on all the other models for operating the various brake control systems. Both types, hydraulic and vacuum, are used to control the ABS brakes, stability control and TRAC, including something called LSD, which is an electronic use of brakes to simulate limited slip in the differential.

Visually you can tell which one you have. The hydraulic type is an all-in-one looking unit -- like yours -- with the brake fluid reservoir, numerous electrical connections, an integrated ECU, and no big vacuum booster against the firewall. On the other hand the vacuum type looks more akin to a traditional arrangement with a brake fluid reservoir sitting on top of a master cylinder, and large vacuum booster against the firewall, but the actual ABS and stability controller stuff is on the other side of the engine bay just above the RH wheel well.

Both types of systems operate by the selective operation of the brakes. The off road feature requires rapid and forceful application of brakes on-and-off, something that is greater and quicker than that which can be had by just boost pressure from a vacuum booster alone.

So what's all this got to do with the power steering pump?

In order for the PS pump to have any type of interaction with the brake control unit there would have to be an electrical connection or fluid pressure connection to the brake controller. Neither the vacuum- or the hydraulic-type controller have any fluid connection. So that leaves an electrical connection.

The PS pump on all model Tacomas has a simple oil pressure switch mounted and is the only electrical connection. It is a single wire on-off switch that connects to ground and is normally closed (grounded). The wire feeds only to the engine ECU.

 

The P/S pump is used in a hydroboost system, found on a lot of GM trucks, and diesels in general since they don't produce intake vacuum... or at least didn't before the newest ones that now have throttles like a gas motor.

If your dealer thinks that's a hydroboost system, and that the P/S pump has anything to do with it, I'd be rather concerned. I can't say I've ever seen a north American Toyota with a hydroboost brake system, for that matter. AFAIK what you have is 100% electrical, and not serviceable when it dies. I've also looked for aftermarket availability (even for an OE part) for a few Lexuses that used them (I think they started with LS and maybe GSes in the early-mid 00s) and never succeeded. Junkyard might be an option, although of course it may be closer to failing, and they tend to know what they got on spendy stuff like that and price accordingly.

 

Have you been driving it for almost a year with bad brakes?

 

Don’t mean to hijack this thread, but if any of you could chime in on this other thread about brake boosters it would be really appreciated.

https://www.tacomaworld.com/threads/2007-tacoma-brake-booster-part-please-help.619364/#post-21084486

 

thats a load of cabbage

 

Hello All

Found the electric pump and accumulator new in Toyota packaging for sale on the Internet $250.

It took about 1 hour to change it and after bleeding it in accordance with the OEM manual I have a PDF copy of it works well.

The amazing part is how the bleed is performed without using any tools. Just turn Ignition on wait until pump stops running then turn ignition off and pomp brake pedal until no boost. Do this about 6 or 8 times and you are finished.

I don’t think the pump was bad I believe it was the accumulator.

Phil P

 

Hi all (first post),
I think I am in need of the electric pump and/or accumulator myself. It looks exactly like Phil's. I have a 2006 Tundra 4x4 limited quad cab. I just had brakes and calipers replaced. The brake pedal now often goes down close to the floor when only medium/light pressure is applied. Hard stopping is fine but of course I don't trust it or know the remedy other than another one. Could Phil or anyone else point me in the right direction for a replacement? Any advice appreciated.

Thanks

 

yup

 

Can someone tell me what the part number is I need to order for the replacement part in the first picture? I have the same brake system