Why is my brake pedal hard when I apply the brakes?

1987 TOYOTA PICKUP
155,550 MILES • 2.4L • 4 CYL • 4WD • MANUAL
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SFCTRIPLETT57
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When I apply the brake pedal it’s hard why is this, what can cause this problem?

Thanks


Larry Triplett

Iraq War Vet
Oct 15, 2021 at 2:56 PM
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SQM
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Hello,

Typically, hard brake pedal is due to an issue with the vacuum system for the brake booster.
Check the hose that attached to the booster.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Make sure it is secured and does not have any restrictions or crack. It will be a good idea to look over all the vacuum hoses and make sure they are all in good shape.
Also inspect the check valve that is located on the brake booster (at the end of the hose). If that valve is stuck closed, you will have hard pedal.
Another possibility is a bad brake booster.

Let me know what you find or if you have any questions.
Thank you.
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Oct 15, 2021 at 7:05 PM
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SFCTRIPLETT57
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Thank you Sir.
Oct 20, 2021 at 1:07 AM
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SQM
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You are welcome.
Oct 20, 2021 at 8:03 AM
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SFCTRIPLETT57
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Where is this check valve located on the brake booster?

Thank you Sir.
Oct 22, 2021 at 5:01 AM
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SQM
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Depending on the type of booster the check valve can look different.
Can you upload a picture of the brake booster?
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Oct 22, 2021 at 8:12 AM
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SFCTRIPLETT57
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My truck is in the shop having the carburetor rebuilt.
Oct 23, 2021 at 11:07 AM
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SQM
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No worries. Those pictures are the two different type of boosters for that truck.
Oct 23, 2021 at 8:35 PM