Brake Pedal Hard To Push In Boost

NeverBoneStck

So just recently while I’m beating the car my pedal feels like a brick wall while in boost than slowly goes back to normal. Anyone have this happen or know what I should do?

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Juiced! That is all you need to know !!

BGTV8

Power booster in the brakes won't work when you are on boost. You'll need a vacuum pump to supply vacuum to the brake booster

phunk

Should feel similar to pushing the brake with the engine not running, since you have no vacuum assist, as BGTV8 was saying. What should you do? Squats

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takemorepills

Most all cars have a check valve from intake manifold to booster to prevent vacuum loss from booster when engine isn't creating vacuum.

When the booster is not being supplied with vacuum, you get about 2-3 uses of power assisted brakes before the pedal becomes much harder to push.

So, a few things could be happening:

-everything is mechanically OK, but you are using brakes whilst the engine is not producing vacuum. Ideally you should generally be off the accelerator when applying brakes, which should cause the engine to go to vacuum. So, are you applying brakes at same time as accelerator?

-the vacuum check valve could have failed allowing booster vacuum to bleed off.

-is there an engine condition causing the manifold to not go to vacuum when you release accelerator? Boost leak, maybe?