Hard brake pedal at times.

[Gear hEAD]

Hi I have a 87 buick grand national. Recentley I have experienced a hard brake pedal when I have to brake suddenly. The brake switch had been changed before I owned the car. I have not looked into the combination valve if it is cast or not.

[Keller]

How many miles on the car? Do you know when the accumulator has last been changed? Do you have any reason to suspect a problem?

I would go through to analysis tree and determine if a problem actually exists.

[boutime]

had same problem. got hard on sudden braking. changed acc. ball and all is well.

[Gear hEAD]

Thank You for your response. It acts up if you are driving 35 mph, brake a little and then all at once panic brake it take a lot of force on the pedal.

Gear hEAD

[Keller]

http://www.gnttype.org/forums/showthread.php?t=9519

[buickgn38sfi]

Do yourself a HUGE favor and convert your brake system over to vaccum before you kill someone or yourself. POWERMASTER brakes are junk!

[Electrajim]

No matter what brake system you have, be sure that someone didn't disable the brake warning light, or it may be burned out.
It won't fix your problem, but I bet it will help warn or remind you that there is a problem.

Test it by setting the emergency brake. Should turn on light. (same one i think)

ElectraJim

[Gear hEAD]

Thanks for the tip. I didn't think of that. I did engage the parking brake and you are right, the light did not come on. I'll replace it and try it again. I'am thinking probably the accumulator ball.