GMC Brakes

rogerw24 · Post by **rogerw24** » Thu Nov 05, 2009 1:51 pm

Hi

Hope somebody can help. The brake pedal on my GMC has gone hard and only by pressing very very hard will it just about stop.

I am told that it is the hydrovac but before I take it apart thought it best to ask. If it is the hydrovac is a repair kit from Rex Ward the way to go.

Thanks in advance for any help.

KEVINABR · Post by **KEVINABR** » Fri Nov 06, 2009 3:35 pm

Hi Dodger have you checked your master cylinder first to make sure thats not pressurising up and not backing off.

see ya soon.

dr deuce · Post by **dr deuce** » Sat Nov 07, 2009 6:42 pm

If the truck is not dragging brakes and you get some stopping action from the pedal, the problem is the booster

rogerw24 · Post by **rogerw24** » Sun Nov 08, 2009 4:18 am

Thanks for the replys. The brakes are not draging at all and there is some brake when you really push it hard and you can hear the engine changing note as you do this. Now how good is the repair kit for the hydrovac, is this an option or is it a new hydrovac.

Thanks again

Roger

robc · Post by **robc** » Sun Nov 08, 2009 12:49 pm

Before taking off the hydrovac cylinder, it might just be worth checking the one way valve, between manifold and pipe that runs to hydrovac, it might have become clogged or rubber come off valve seat.

rogerw24 · Post by **rogerw24** » Mon Nov 09, 2009 4:30 am

Thanks for that Robc I will have a look today

Roger

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