Power brakes/conversion
Thread Starter
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Senior User
Joined: Jun 2005
Posts: 176
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From: Temple, TX
Power brakes/conversion
When I bought my F100, the previous owner said that the truck originally had manual brakes, but he put in a boosted master cylinder. Braking has always been weak - I have to push the pedal almost to the floor to stop the truck, and it won't lock the brakes at all. I've bled the system multiple times with no improvement.
My thinking is that I need to change out the calipers/drum system with those from a power brake equipped truck. Does that seem correct, or is the problem elsewhere?
Thanks,
Richard
My thinking is that I need to change out the calipers/drum system with those from a power brake equipped truck. Does that seem correct, or is the problem elsewhere?
Thanks,
Richard
Elder User
Joined: Aug 2003
Posts: 669
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From: Crestline, California
Does your master cylinder maintain full fluid levels? If not, and your cylinders at each wheel are not leaking, then your master may be leaking fluid into the power brake booster.
this happened to me. New booster, all the difference in the world.
Dak
this happened to me. New booster, all the difference in the world.
Dak
Postmaster
Joined: Jul 2005
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use this link for brake diagnositic, refer to the portion for diagnosing your brakes. Let us know what you found as the problem. It will help others with the same problem.
http://www.classicperform.com/TechBo...tm#testbooster
http://www.classicperform.com/TechBo...tm#testbooster
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Joined: Mar 2003
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From: Indiana
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Postmaster
Joined: Jul 2005
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Mil1ion, I am sorry that the link did not work, and honestly respect your Ford expertise as I've seen your post on other threads. As you are aware I am obviously involved in sharing my knowledge and experience's in sharing my knowledge in rebuilding these classic and well built Ford's.
staysbroken, it is difficult to diagnose your brake problem if you do not reply to others post. My question to you is what brake items have you replaced and adjusted on your brake system?
staysbroken, it is difficult to diagnose your brake problem if you do not reply to others post. My question to you is what brake items have you replaced and adjusted on your brake system?
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Thread Starter
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Senior User
Joined: Jun 2005
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From: Temple, TX
Thanks for all the good info so far. I haven't had a chance to do any work on it as of yet, but should have most of the day today to mess with it. And as for the parts I've replaced, I personally havent replaced anything (was all done by the previous owner), so I'm not entirely sure what's original and what's not. I did have to lengthen some of the brake lines and relocate the proportioning valve when I did my 460 swap though, but it didn't seem to have any affect on the problem.
The master cyl does maintain a consistent level, so I don't think the system is leaking anywhere. And when I bled the brakes the last time, I didn't know what that pin was on the master cylinder, so that will be the first thing I try today.
Thanks guys
The master cyl does maintain a consistent level, so I don't think the system is leaking anywhere. And when I bled the brakes the last time, I didn't know what that pin was on the master cylinder, so that will be the first thing I try today.
Thanks guys
Last edited by staysbroken; Aug 17, 2005 at 04:01 AM.
Thread Starter
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Senior User
Joined: Jun 2005
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From: Temple, TX
- update -
66f14evr suggested that I check the brake pedal itself, as there were 2 different pedals depending on whether the truck came with manual or power brakes. Sure enough, it was marked MAN BRK. I'm going to find a pedal from a p/b truck and see if that fixes the problem.
66f14evr suggested that I check the brake pedal itself, as there were 2 different pedals depending on whether the truck came with manual or power brakes. Sure enough, it was marked MAN BRK. I'm going to find a pedal from a p/b truck and see if that fixes the problem.
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
i think it may be a bad master cylinder which is allowing fluid to by pass fluid past the rings. kragen has them for 16.00 www.kragen.com