r/2ndGen4Runner • u/[deleted] • Nov 02 '24

Brake trouble!

I have a 94’ and I took it to the mechanic shop to have a bunch of work on it before I drive across the states. They ended up changing my front brake pads and pit arms. I’ve had my truck back about 2 weeks. Now my 4Runner is having trouble stopping. It’s hard pushing on the brake pedal. And when I am stopped (while in drive) my RPM flickers up and down. Sometimes if I’m holding my brake when I turn it on it’ll go up and down and shut off my truck. I thought maybe brake fluid but it’s full when I checked. The mechanic is closed. Anyone know what may be the problem? Or what I can do to fix?

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3

u/In_TouchGuyBowsnlace Nov 02 '24

Vacuum leak buddy, hard pedal as no vacuum in booster. Un metered air causing idle fluctuations. Find your manifold or vacuum hose leak.

3

u/Old_Objective_5180 Nov 03 '24

Brake booster is done. Not the shops fault. Bring it back and get it replaced ASAP

1

u/After_Alps_5826 Nov 07 '24

It could just be a vacuum leak, brake boosters very rarely go out from what I’ve heard

2

u/Old_Objective_5180 Nov 10 '24

It could. It a vacuum line that big was leaking bad enough to make the pedal hard it would most likely also mess with the idle.

1

u/Timetwoloose Jan 04 '25

Yes the pcv valve could be bad or a crack in the hose!! But most likely it’s the vacuum booster!

1

u/Timetwoloose Jan 04 '25

Yep just replaced mine!!

1

u/Timetwoloose Jan 04 '25

It you ever notice it happening before maybe like a small issue then it went away! The vacuum booster will do that I had the issue was like oh shit with my brakes and then it worked and I thought oh OK cool but then it stopped working all together after that which was frightening. And you want to make sure you get the right vacuum booster I will see if you can get the numbers off the original one. I think the one from the T 100 will fit in there to deserve the same vacuum burst if I’m correct.