Looking for 2 lb - 4 lb residual valve info / source for 4 wheel disc brake speedster. Anyone run into having to use this, source for these in a metric thread and did it improve the usual low pedal disc brakes ?......
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Looking for 2 lb - 4 lb residual valve info / source for 4 wheel disc brake speedster. Anyone run into having to use this, source for these in a metric thread and did it improve the usual low pedal disc brakes ?......
Willwood sells a 2psi unit with a 1/8 NPT in and out. I made some adapters to m10x1.
It did help but in the end I rebuilt my pedal cluster and changed my master cylinder to get rid of all the play.
Bruce
It did help but in the end I rebuilt my pedal cluster and changed my master cylinder to get rid of all the play.
Bruce
Bruce ...... what MC did you change to ?
You may want to touch base with Joe Soltis, I think he is using a dual cylinder system from CNC. Here's a link to one of his photo's
https://www.speedsterowners.com/files/view.asp?sf=Jogyver&f=DSC02434%2EJPG
https://www.speedsterowners.com/files/view.asp?sf=Jogyver&f=DSC02434%2EJPG
We use a dual circuit MC from the late model Brazilian Fusca (Beetle) which crosses to the later Ghias (I believe). I'll have to look up a part number and e-mail it.
CB sells a 2lb 1/8" NPT (PN 6112) and a 4lb Metric (PN 6609).
Carey
CB sells a 2lb 1/8" NPT (PN 6112) and a 4lb Metric (PN 6609).
Carey
Alan ,
Try CB performance. They have the 4 lb Residual valves. I used one intially before I changed over to the CNC brake system. It worked well. You'll need to purchase some extra fitting to make it work. The valves are 1/8 NPS . The 2lb just doesn't cut it.
Try CB performance. They have the 4 lb Residual valves. I used one intially before I changed over to the CNC brake system. It worked well. You'll need to purchase some extra fitting to make it work. The valves are 1/8 NPS . The 2lb just doesn't cut it.
Carey / Joe ...thanks for the leads!
Alan
Alan
Alan,
My black Speedster has the single pin kghia front discs and CBperformance rear disks.
I used the CBperformance residual valve on the rears only. The valve screws into the master cylinder port. I'm using a dual stage VW master cylinder from around 1970 vintage.
When I had rear drums, I could keep the rears shoes adjusted so pedal was always at the top.
I had the brake pedal freeplay problem even with the residual valve when I added the rear discs until I finally got everything bled. I kept getting air from The CB rear Calipers. They used a flat washer seal that leaked slightly no matter what I did. Sucking air...
I ended up making fittings (pipe thread with double flared tubing)for the rear calipers to correct the problem. Pedal stays near the top now.
Also, if you're using the Rear Calipers that have the E-brake cables, check for clearance at the caliper near the e-brake return spring. Mine would hit the Frame (near the welded step in the frame where the rear bay is stacked and welded) on suspension compression. I cut the frame extension angle slightly to clear.
Greg B
My black Speedster has the single pin kghia front discs and CBperformance rear disks.
I used the CBperformance residual valve on the rears only. The valve screws into the master cylinder port. I'm using a dual stage VW master cylinder from around 1970 vintage.
When I had rear drums, I could keep the rears shoes adjusted so pedal was always at the top.
I had the brake pedal freeplay problem even with the residual valve when I added the rear discs until I finally got everything bled. I kept getting air from The CB rear Calipers. They used a flat washer seal that leaked slightly no matter what I did. Sucking air...
I ended up making fittings (pipe thread with double flared tubing)for the rear calipers to correct the problem. Pedal stays near the top now.
Also, if you're using the Rear Calipers that have the E-brake cables, check for clearance at the caliper near the e-brake return spring. Mine would hit the Frame (near the welded step in the frame where the rear bay is stacked and welded) on suspension compression. I cut the frame extension angle slightly to clear.
Greg B
Replace the stock master cyclinder, 19.05mm bore, with a Custom Speed & Parts (the German company) master cyclinder #611 015 000, 20.64mm bore and adapter kit #611 017 111. These parts meet stringent German DOT standards and worked well for me. I did a bit of research and this seemed to be the way to go. A little pricey at $300. They have a US distributor in the LA area.
Good Luck, Have Fun
Joel
Good Luck, Have Fun
Joel
Alan: I have a Willwood 1
Great items to look at as possible sources of the pedal problem... ....I did order the CB 4 lb MC residual valve and will look into the other possible faults...
Many thanks I am still learning !
Many thanks I am still learning !
Alan, What type of disks do you have? A really big thing in the GL bettles is to use 944 porsche parts. Its VERY common. I think that if you change to a MK1 Golf/ rabbit MC which has a 20.64mm circuit this will give you more pressure. I am assuming that your brakes travel too far before they start to work. Go to www.vdubengineering.com for more info. Email them and support them, the owner is very nice and helpful.