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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,977
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Hugh,
One problem with the old Brit cars. Their pedal goes down a certain amount then pressure keeps it from going futher. When you take a line off or anything to relieve pressure, it allows the piston to go futher.
If the master cylinder has been on there a while it can build up a ridge in it where the pedal travel stops. If you for any reason can push the pedal futher than normal, I have seen times where the rubber sealing ring can be torn or damaged to the point where it no longer will build up pressure.
Might take a line directly off of the MC and confirm that you have good hard pressure before moving any futher.
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2021 Subaru Legacy, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB
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