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oxsign
Samba Member
Joined: February 19, 2006
Posts: 607
Location: Sanford, FL
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 Posted: Fri Jan 04, 2019 10:42 am Post subject: Bad master cylinder? |
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‘71 square and I replaced all the lines (front/back) and the rear wheel cylinders. Bleeding the rear seems like it’s going fine. When I go to the front, after a couple “pumps” it seems like the pedal is stopping halfway down as though it’s “blocked”. They are catching and working in the front, but just odd that once it hits that halfway point it doesn’t move anymore. The Ghia (‘70) goes to the halfway point and gets hard but feels like it has some give still (spongy). I did put all steel braided lines on the square but I doubt that would do it. I know they’re supposed to help with the spongy feel.
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1971 Squareback, fully bagged, 1776.
Build thread here.....
https://www.thesamba.com/vw/forum/viewtopic.php?t=...mp;start=0 |
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raygreenwood
Samba Member
Joined: November 24, 2008
Posts: 21520
Location: Oklahoma City
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| Posted: Fri Jan 04, 2019 2:17 pm Post subject: Re: Bad master cylinder? |
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| oxsign wrote: |
| ‘71 square and I replaced all the lines (front/back) and the rear wheel cylinders. Bleeding the rear seems like it’s going fine. When I go to the front, after a couple “pumps” it seems like the pedal is stopping halfway down as though it’s “blocked”. They are catching and working in the front, but just odd that once it hits that halfway point it doesn’t move anymore. The Ghia (‘70) goes to the halfway point and gets hard but feels like it has some give still (spongy). I did put all steel braided lines on the square but I doubt that would do it. I know they’re supposed to help with the spongy feel. |
A handful of items can cause this:
1. If the pedal is not adjusted for freeplay properly your outer piston can be covering the fluid inlet port. This causes the outer most circuit ...the first one the pedal pushrod comes in contact with...to have too little fluid volume in it.
2. It can be leaky flap valves on that first circuit or a leaky inner cup on that outer circuit causing fluid bypass.
Understand...if you needed to replace front calipers or rear wheel cylnders or lines...they are all made of the same type of rubber and are the same age. If one component needs replacing...the other components are usually not far behind.
I would never do a a system rebuild like that without a new master cylinder as well. Ray |
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