67 800 break trouble

zcarhide

Member
So I I swapped out my re wheel cylinder and bleed the system good and what is happening now is if stop and my breaks at say a red light the break peddle slowly goes to the floor and I lose my breaks
 
Only two main possibilities I can think of. Either you still have air in the system, or you're losing brake fluid somewhere. Check the fluid in your reservoir and check for fresh fluid leaks at all four corners. If res level is up good and no leaks are found, then you know you have air trapped in the system.
 
What you're describing is usually a master cylinder with an internal leak. Unless you see a puddle of brake fluid on the ground your brake lines are not leaking.

It's common for a mc to fail when bleeding brakes, especially if it's been installed for a while. What happens is the bottoms of the bore's get corroded and when the pedal goes to the floor during bleeding the corroded area of the bore messes up the seals.
 
If you've got a firm pedal that slowly sinks to the floor, I wouldn't bother with the rebleed. You will need to bench bleed the new mc though.
 
Either one looks like it will work, but the second one will support this board and comes from good people who know what they are doing.
 

I edited your post with a link to the same master cylinder that our competitor sells with ours which is $50 less in cost and includes a new pushrod.
 
Jeff I ordered the mc that you listed here and the push rod does not hook up. The end on the new push rod has a joint in it. For it to hook up my break peddle I need to get the joint out unless I'm missing something. Does post on break peddle unscrew? Or do I need to press the joint out can that even be done?
 
We sell a lot of these mc kits with the heim joint push rod to s800 owners like you. The threaded joint is meant to replace your existing push rod.
 
I get that. I just don't see how it can hook up with the joint in there is no way for joint to fit on to the post on the break pedal what do people do to get them to fit. Even if get joint out I don't I think I will b able to get snap spring back on. I'm looking for an idea of how to hook this all back up
 
I think I'm over thinking this all I need to do is drill a new hole and attach with a bolt ans washers and lock nut.
 
Our brake master cylinder and pushrods is a direct bolt on part. No cutting, drilling, etc is required. I suggest taking a picture of your brake pedal so that we can see what you have going on as something does not seem right with your set up.
 
Take look I up loaded the photos the last one is from the old mc looks like I can grind that lip down and it will work
 

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