Major brake issue... Please help

[Chase77]

I'm at wits end with the brakes in my wife's truck. Sometimes if accelerating out of a full stop, the truck will not accelerate and feels like the breaks are locked up. When this happens the pedal is too hard to push down on. I've not run across this problem before and can't figure it out..... I'm assuming this has to be something with the booster... right? Any advice would be much appreciated.

 

[WristPin]

put your break shoes on wrong?

 

[KLF]

I assume you are talking about the '92 4Runner? If not, which truck, model, year, etc?

Have you jacked up the truck and tried spinning the wheels by hand to see if they are dragging?

If the rear brakes (not breaks) are dragging, it could be that the linkages behind the drum are sticking, particularly the e-brake parts. Maybe back off the shoe adjusters, pull the drums and look for issues.

 

[Chase77]

Yes this is the 92.... I can't isolate the problem and it's left my wife stranded twice. It happens out of nowhere and goes away without explanation. I just redid the back drums last night and they are definitely put together correctly. Does any of this sound like a booster problem?

 

[87toycrawler]

sticking wheel cyclinder or caliper!!!!!! not the booster

 

[tntoyota]

sticking wheel cyclinder or caliper!!!!!! not the booster

X2 and possibly going for the flame awards here but, thats a part you can get away with not buying from Toyota....


$30-$50 IIRC at ORileys. (i cant remember, with core so I hope your not attached to it just make sure its a V6 )

 

[lonezuk]

Rear e-brake alum block is messed up and the steel arm sticks and will not release.
This assumes that she uses the e-brake.
Replace the alum block, or use a file and clean it out, requires that you take the rear brakes apart.

 

[KLF]

Rear e-brake alum block is messed up and the steel arm sticks and will not release.

That's the first thing I thought of, but 2nd gen 4Runner rear axles don't have these blocks. The cable passes thru the backing plate at an angle, no bellcranks.

 

[Chase77]

I assumed it couldn't be the calipers b/c it never pulled in one direction when stopping.... Hasn't locked up in a few days but when you press the brake you have decent stopping power and then the pedal will rise up back towards you and has full breaking power....... What the hell is going on here The only thing I haven't replaced is the front calipers and I guess I'll try that next....

 

[DblTap]

Chase,

Is it front, back or both? I am having the same problem with my FJ60 on just the front brakes. There is a thread on here where another guy had the same issue and determined it was the booster on his. That link is here: https://forum.ih8mud.com/40-55-series-tech/111717-brakes-locked.html?highlight=brakes+locked
Don't know if this will help you or not but just in case.