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08-22-2018, 12:44 PM
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#1 |
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Registered User
Join Date: Jul 2012
Location: Space Coast, Florida
Posts: 403
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Power brake petal drop question
I have installed a stock power brake setup on my 68, and I don't have the engine running yet. I have bleed the brakes but the pedal will still go down slowly if I keep pressure on it. Is this normal with power brakes and no vacuum?
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1968 SWB Step Side, Big Block, 4L80E , Running! |
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08-22-2018, 01:38 PM
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#2 |
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Who Changed This?
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,209
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Re: Power brake petal drop question
What all changed? Did you just add a booster and master? Do you have the shoes all adjusted to the drums?
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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08-22-2018, 02:07 PM
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#3 |
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Registered User
Join Date: Jul 2012
Location: Space Coast, Florida
Posts: 403
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Re: Power brake petal drop question
Petal is very firm and doesn't go far down on the initial push, but with continued pressure it moves slowly down to the floor.
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1968 SWB Step Side, Big Block, 4L80E , Running! |
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08-22-2018, 03:51 PM
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#4 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,209
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Re: Power brake petal drop question
Is it the old master cylinder? That's a symptom of a bypassing piston, which indicates that it should be replaced or rebuilt.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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08-22-2018, 07:38 PM
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#5 |
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Registered User
Join Date: Jul 2012
Location: Space Coast, Florida
Posts: 403
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Re: Power brake petal drop question
Brand new. Its a 1 1/8" bore for power brakes. Took off my 1" bore manual brake master to install it.
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1968 SWB Step Side, Big Block, 4L80E , Running! |
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08-22-2018, 07:40 PM
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#6 |
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laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,041
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Re: Power brake petal drop question
The fluid is going somewhere. It's either bypassing inside the master or there is a leak somewhere.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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08-23-2018, 12:01 PM
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#7 |
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Senior Member
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,210
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Re: Power brake petal drop question
I agree not right. Should hold up longer than your leg will. Either a leak in the system or a bad master cylinder
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Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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