Kieronpollock
Club Member
Hi All
Looking for a fresh point of view on a brake issue with my restored 240z.
I have a new brake set up including a 1” Wilwood Master cylinder and a new 7.5” brake booster from Zcardepot, parts that came with the car as new and unused.
Car has been to an MOT tester to use their brake checking system and the cars has excellent braking pressure (attached) and is balanced properly. There are no brake fluid leaks.
The length of the push rod from booster into MC has been checked and is correct with brake pedal engaging instantly as you would expect.
Issue is the car has a stiff brake pedal, and a slight hiss can be heard when engine is running so infers there is a vacuum leak.
However, the check valve is brand new and has been checked, the booster has been pressure tested using a brand new testing kit and holds pressure.
The garage says it’s the booster at fault (on the basis of if in doubt replace it) however, it’s not easy to replace a booster especially as the original booster would have been a series 1, 1972 7” booster with the small kidney shaped bolt pattern, so hard to come by and would require refurbishment. I also don’t want to buy another Zcardepot 7.5” booster if at all possible.
I’m also concerned a 7” booster if found and refurbed may not be up for the job with the 1” Wilwood MC.
So my restorer Andy who has had many years experience on cars is a bit stumped as the stiff pedal and hiss point towards the booster but the usual tests say differently.
Any suggestions as where to look and to definitely rule out/in the booster would be helpful eg is it possible to test the other (pedal) side of the booster?
Thanks in advance
Looking for a fresh point of view on a brake issue with my restored 240z.
I have a new brake set up including a 1” Wilwood Master cylinder and a new 7.5” brake booster from Zcardepot, parts that came with the car as new and unused.
Car has been to an MOT tester to use their brake checking system and the cars has excellent braking pressure (attached) and is balanced properly. There are no brake fluid leaks.
The length of the push rod from booster into MC has been checked and is correct with brake pedal engaging instantly as you would expect.
Issue is the car has a stiff brake pedal, and a slight hiss can be heard when engine is running so infers there is a vacuum leak.
However, the check valve is brand new and has been checked, the booster has been pressure tested using a brand new testing kit and holds pressure.
The garage says it’s the booster at fault (on the basis of if in doubt replace it) however, it’s not easy to replace a booster especially as the original booster would have been a series 1, 1972 7” booster with the small kidney shaped bolt pattern, so hard to come by and would require refurbishment. I also don’t want to buy another Zcardepot 7.5” booster if at all possible.
I’m also concerned a 7” booster if found and refurbed may not be up for the job with the 1” Wilwood MC.
So my restorer Andy who has had many years experience on cars is a bit stumped as the stiff pedal and hiss point towards the booster but the usual tests say differently.
Any suggestions as where to look and to definitely rule out/in the booster would be helpful eg is it possible to test the other (pedal) side of the booster?
Thanks in advance