Power Brakes are locked - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ksbeatty · 10-12-2008, 04:18 PM

I have just recently adjusted my brakes by the brake pedal and drove it once or twice and then today, the pedal wouldn't move. I was like the brake were applied the entire time. I doconnected the pedal from the MC and tried to move the push bar into the booster and nothing. just locked up.
It was a new booster and new MC with very low miles on them like mayber 50. Any ideas?

Wrenchbender Ret · 10-12-2008, 05:41 PM

You need a little free play in the pedal before it starts pushing the power brake unit. Also the shaft between the master cyl. & booster could be too long.

OhioDan · 10-13-2008, 04:18 AM

Sounds like you have the pedal adjusted to tight, and the master cyl. won't release the built-up pressure. As stated above, need about 3/8-1/2" freeplay at top of pedal. Just my $.02.

**LockDoc** · 10-13-2008, 11:17 AM

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If you crack a brake bleeder screw it should release the pressure...

LockDoc

10-12-2008, 04:18 PM	#1
ksbeatty Registered User Join Date: Mar 2006 Location: Kansas Posts: 300	Power Brakes are locked I have just recently adjusted my brakes by the brake pedal and drove it once or twice and then today, the pedal wouldn't move. I was like the brake were applied the entire time. I doconnected the pedal from the MC and tried to move the push bar into the booster and nothing. just locked up. It was a new booster and new MC with very low miles on them like mayber 50. Any ideas? __________________ 1969 GMC 3/4 Ton 4x4 2" Lift, A/C, PS, PB 383 Stroker, 700R4, 205, 4.10 GM Medium Bronze (Copper Poly) no new nick name yet. She is to pretty to be the Beater. http://67-72chevytrucks.com/vboard/s...d.php?t=241855

10-12-2008, 05:41 PM	#2
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,229	Re: Power Brakes are locked You need a little free play in the pedal before it starts pushing the power brake unit. Also the shaft between the master cyl. & booster could be too long.

10-13-2008, 04:18 AM	#3
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	Re: Power Brakes are locked Sounds like you have the pedal adjusted to tight, and the master cyl. won't release the built-up pressure. As stated above, need about 3/8-1/2" freeplay at top of pedal. Just my $.02. __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.

10-13-2008, 11:17 AM	#4
LockDoc The Older Generation Join Date: Aug 2006 Location: Montezuma, Iowa Posts: 25,818	Re: Power Brakes are locked - If you crack a brake bleeder screw it should release the pressure... LockDoc __________________ Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 -



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