1969 brake master c...
 
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1969 brake master cylinder, drum/drum

 

(@woogeroo)
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Joined: 2 months ago
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1969 brake master cylinder, drum/drum

1965 chevy c10 pickup, 1965 style power brake booster

Hi folks.

This has been the setup in my truck since I bought it, I have had to replace a few brake cylinders in that time.

This latest one though does not seem to want to work, so either I am bleeding it wrong or it is bad off of the shelf.

brake cylinder pic

This setup has the external valve thingy, before it goes down to the wheel cylinders.

I did the bench bleed before installation, no more bubbles. I mounted it up. I did the brake bleed, right rear, left rear, front right, front left around again.

Seems like it only has the rear brakes, which is why I was replacing it.

I did the crack all four bleeders at each wheel with a tube on them, submerged in brake fluid and slowly pumped the brakes... then closed them up.

Same deal.

Anyway... anything else to check or try again before I swap it out for another unit?

I am out of ideas at this point.

Thanks.

-Woog


   
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Chip
 Chip
(@chip)
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Joined: 55 years ago
Posts: 155
 

I would check the "external valve thingy" it may be stuck.

How sweet the roar of a Chevy four
Participant on Chatter since 11/22/2001
19758 posts on the former Chatter site


   
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(@anthony-williamson)
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Joined: 19 years ago
Posts: 170
 

If my suspicions are correct the external valve (proportioning valve) has a switch screwed into it, disconnect the wire and remove the switch and refit and connect. This switch operates the brake fail light on the dash and blocks fluid to the half of the system that causes a bad balance of pressure.

Tony 


   
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(@woogeroo)
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Joined: 2 months ago
Posts: 9
Topic starter  

I had two leaking brakes lines... fixed one right away... then found the other one. Having a hard time finding right size line with the correct fitting, so looking like I will have to build my own. old trucks are fun.


   
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