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Username Post: Power brakes-master cyl and vacuum booster        (Topic#357621)
Posts: 96

Age: 82
Loc: Klamath Falls, OR
Reg: 03-06-17
08-12-19 06:45 AM - Post#2773019    

Here I go again, another problem with my upgrades. I installed a disk brake system on my 54, along with a new brake cylinder and booster on the firewall, I should say I had a stock OEM power brake system on my car. ,but I always thought it wasn't quite enough, so the new update. OK, the problem I have is; when you step on the brake pedal it is hard as a rock and will not activate the master cylinder. I have adjusted the rod that goes to the booster, and checked the rod that comes out of the booster and everything works until all hooked up and then it won't engage.The master cylinder won't push the fluid thru to the brakes. I have discussed this problem with local mechanics and they are as confused as I am,with no answers. So I thought I would pass this along to the experts here. thanks guys

1954 Chevy Bel Air Convertible



Valued Contributor
Posts: 3676

Loc: Northeast CT
Reg: 06-27-10
08-12-19 07:05 AM - Post#2773024    
    In response to Fields

Remove the brake line from the master cylinder, place a few towels over and under the master cylinder to catch the brake fluid from spraying all over, and then give it a try. If it sprays brake fluid, you have a restriction in the brake lines. If it doesn't, then it is either the booster or the master. To check the master, try bench bleeding it with a full stroke. If the master checks out good, then it has to be the booster, or the geometry of the pedal to the booster.

Never argue with an idiot. He'll drag you down to his level, then beat you with experience.

Posts: 677

Age: 69
Loc: Slaton, TX
Reg: 10-01-07
08-12-19 08:37 AM - Post#2773034    
    In response to junky

What happens if you have the MC disconnected from the booster and push the pedal? if its hard the problem is probably in the booster. If its soft then the MC. Could also be too long a rod between the booster and MC not letting the piston in the MC return fully and opening up the return ports. IF this was the case the result would be locked up brakes. First pump would be normal then a hard pedal.

'38 Chevy Coupe Gasser 409 powered
'50 Sedan Delivery 401 Nailhead powered
'62 Buick Electra original survivor

Edited by lobucrod on 08-12-19 08:38 AM. Reason for edit: No reason given.

Posts: 96

Age: 82
Loc: Klamath Falls, OR
Reg: 03-06-17
08-12-19 09:08 AM - Post#2773036    
    In response to lobucrod

Thanks guys, I will try what you suggested

1954 Chevy Bel Air Convertible



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