2010 Tacoma Brakes Not Working

I have been having brake issues on my 2010 Tacoma SR5 TRD Off Road. At first the brakes were working but I was getting a brief, soft hissing sound. I checked under the truck and brake fluid was leaking from the front driver's caliper. Both calipers were in pretty rough shape so I replaced them both as well as the brake tubes running to them. The owners manual says it's a type b brake system and to pump the brakes 20+ times and then fill the reservoir with fluid, which I did. However, now when I hit the brakes the peddle goes straight to the floor and makes a clicking sound with no brakes at all.

I've attached a video of the sound it's making and any help would be appreciated. It's not a master cylinder / booster system like I'm used to so I'm not sure what else needs fixing.

 

Did you bleed tha brakes?

 

You have, or are getting air in the lines bro. Sorry

 

You have a very common issue.

Once air is introduced into the system, it gets trapped inside the abs modules.

If you have absolutely no pedal pressure you won’t be able to use the backyard mechanics method of slamming the brakes & causing the abs to activate, then bleeding. You’re going to need to use the tech stream software which dealerships and some shops have. Or buy the special scan tool & do it yourself. If you search for it, someone found one that works but I think there’s some model years it didn’t.

For future reference, someone posted if you leave the pedal slightly depressed, that keeps the fluid from draining.

Oops, I misread, it didn’t say you bled, just pumped. Yeah try bleeding conventionally first.

 

Sorry for the late reply - out of town. I bled the brakes manually myself which got them back enough to drive to the shop and have them bleed them. Now that’s been done, I’m still getting a hissing sound when I put my foot on the pedal. To me that says it’s a bad brake booster but I’m not sure what that means with this type of system.

Is it that unit in the video that needs to be replaced? If so, what’s the part number?

 

OP, if you have a techstream clone or know of someone with such see if there is a code stored and report back.

 

I don't have access to techstream, but I did have my brakes bled at the shop. Ever since then, the brakes have returned but the hissing sound has continued and I saw today that the brake fluid level in the reservoir has gone up, so the hissing sound is definitely air getting into the brake system. I now think that this is what was happening before and pressure just kept building up in the brake system until the brake line burst from the caliper causing the initial leak.

The last two images are where the fluid level was 2 weeks ago vs where it is today.

Is there another unit besides the one pictured that would potentially need to be replaced?

 

When you say the shop, is that a dealership? An independent repair shop? Do you know the shop is trustworthy and does good work? Did you ask them to bleed the brakes only or did you also mention the noise? When you got it back from the shop, is that where the fluid level was inside the master cylinder reservoir (white container)? The fluid level is low but if it’s above the minimum line it’s the brakes should work. Still I would fill it to the maximum line.

I’m suspecting the master cylinder. It’s the cylinder shaped thing attached to the brake pedal.

You could try this. Find a small helper. Neighbor’s child or something. First get your head on the floor board looking up with a flashlight. You should be able to find the master cylinder. It might look leaking. Have the small person press the pedal while you watch. You might be able to pinpoint the noise source. Maybe it’s squeaking pedal pivots or spring or brake light switch.

 

The hissing sound is more probably either the pump running and/or fluid leaking by somewhere internally.
The pump shouldn't run all the time, it should run a few seconds at key on and/or when you use the brakes to replenish the pressure in the accumulator.
Being you ran it empty it may still have air trapped in the unit preventing it from working properly.

The fluid level on these systems will vary slightly depending on if the accumulator is charged or not.

No that's the entire hydraulic and ABS unit, there's no other hydraulics besides the lines, wheel cylinders and calipers which unless they are leaking or stuck there's no need to replace. It's only serviced as an assembly, you would need to match the part number on the ECU that's attached to the side of it if your were to replace it.

There is no separate master cylinder on this design system, it's the master cylinder, booster, and ABS unit all in one assembly.

 

The fluid level had dropped back down when I checked this morning, so I think you're right that it was just varying naturally.

The accumulator doesn't run all the time, but I've noticed that it does run for 3-5 seconds almost every time I hit the brake pedal - would that mean it's not able to hold pressure?

Is there a way to bleed the accumulator specifically, or if needs be, replace only the accumulator and not the whole unit?

 

I have a 2014 TRD Off Road and it does the hissing thing as well. I believe the an accumulator making the noise. It's there for the extra braking power needed for the ACT system.
I think what you're hearing is normal, but I welcome other replies.
Bleed them again.

 

I bet it still has some air in it, mine runs at key up and about every 3-4 pumps of the brake pedal.

Here's the bleeding procedure.