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Bill Payne
Experienced User
Username: wimpy

Post Number: 43
Registered: 1-2007
Posted on Thursday, 18 March, 2010 - 03:17 pm:   Edit PostDelete PostView Post/Check IP

Assisting a friend with an S1 with no brakes, (sat for at least 20 years). Rebuilt the single master cylinder, replaced all of the brake hoses and the steel line to the check valve from the master cylinder.

Since there was some rubber hose disintegration,we blew air thru the lines to confirm there were no blockages. We are unable to get fluid to the front wheels no matter how much we stroke the lever. The master cylinder has fluid coming to it and fluid flows to the check valve. Using air at the check valve, we can get fluid expelled from the disconnected lines at the top of the backing plates for each front wheel. Reconnect the lines, pump the master cylinder lever and no fluid makes it out of the bleeder screw.

What are we doing wrong?
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Paul Yorke
Grand Master
Username: paul_yorke

Post Number: 553
Registered: 6-2006
Posted on Thursday, 18 March, 2010 - 06:39 pm:   Edit PostDelete PostView Post/Check IP

Bill, are you getting fluid out both sides of the check valves? If not the check valve must be the problem.

Are the ball bearings seized at the nipples or the nipples blocked?

Nobody has put ball bearings in the hose to wheel cylinder threads have they? (to block of seizing brakes)

What about the rear brakes?
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Bill Payne
Experienced User
Username: wimpy

Post Number: 45
Registered: 1-2007
Posted on Friday, 19 March, 2010 - 12:16 am:   Edit PostDelete PostView Post/Check IP

I can pressurize the check valve(Master cylinder side)with air and we get fluid expelled from the new hoses at the front brake lines at the wheel fitting. Reconnect the lines, completely removed the bleeder screws and got no fluid expelled by moving the lever. All rubber brake lines have been replaced with custom fabricated stainless($22USD/each.)
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Omar M. Shams
Prolific User
Username: omar

Post Number: 121
Registered: 4-2009
Posted on Friday, 19 March, 2010 - 02:40 am:   Edit PostDelete PostView Post/Check IP

My method would be to loosen the brake pipe at the wheel cylider and then see if fluid dribbles out of the union when the master cylinder is activated. If it does, then the problem is at the wheel cylinder. It could be full of solid dusty particles or anything. If no fluid comes out at the wheel cylinder, then work your way back to the master cylinder till you find the blockage.
One thing you must not discount is possible internal recycle of fluid inside a worn/incorrcetly rebuilt master cylinder.
(Paul York - did you get my PM?)
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David Gore
Moderator
Username: david_gore

Post Number: 941
Registered: 4-2003
Posted on Friday, 19 March, 2010 - 10:22 am:   Edit PostDelete PostView Post/Check IP

Bill, I removed your perplexed thread for you.

Regards David

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