Hard brake pedal

Asked by Jun 19, 2018 at 04:16 PM about the 1997 GMC Jimmy

Question type: Maintenance & Repair

97 gmc jimmy, brake pedal is hard to push. Brakes suddenly like slamming on
the brakes.

7 Answers


sounds like a proportioning valve issue.If not a separate component it will be part of the master cylinder.

Ok, I was also thinking power boost. Should I replace both or how,would I determine which is the problem

mabey the vacuum hose to the brake boostef is leaking


Well, replacing a rubber vacuum hose would be faster and a lot cheaper then a master for testing.

Checked the hoses, it is not leaking as far as I can tell. I am not very car savvy but don’t want to pay a mechanic to diagnose.


If your not sure just replace the hose,lot cheaper to try than a master,which could still be the issue.


Bad brake booster check valve

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