Rear brake lock up - bad PBV?
#1
Rear brake lock up - bad PBV?
Just finished replacing the master cylinder for my FC S5 TII with the Mazda 929 MC . Works great! Almost too great.
Rears lock up really fast. I still have ABS unit installed
Bled the system really well.
Pedal is good.
old MC had trashed seals and pedal would slowly go to floor.
I am wondering if the proportioning valve (PBV) could be the issue?
Had a Greddy FMIC installed many years ago and they moved the PBV off the mounting bolt.
I checked if they swapped the front and rear lines to the ABS and they look good.
Anyone use a manual Wilwood proportioning valve or other type?
Something like this?
Everything you need to install an adjustable brake proportioning valve on your Miata! – flyinmiata
https://flyinmiata.com/support/instr...ning_valve.pdf
Cost $65 for above
Stock new is $211
Used PBV unknown. but would it be worth it?
Repair/clean PBV - can it be done? since the MC seals failed could the PBV fail too ? does it have seals?
Rears lock up really fast. I still have ABS unit installed
Bled the system really well.
Pedal is good.
old MC had trashed seals and pedal would slowly go to floor.
I am wondering if the proportioning valve (PBV) could be the issue?
Had a Greddy FMIC installed many years ago and they moved the PBV off the mounting bolt.
I checked if they swapped the front and rear lines to the ABS and they look good.
Anyone use a manual Wilwood proportioning valve or other type?
Something like this?
Everything you need to install an adjustable brake proportioning valve on your Miata! – flyinmiata
https://flyinmiata.com/support/instr...ning_valve.pdf
Cost $65 for above
Stock new is $211
Used PBV unknown. but would it be worth it?
Repair/clean PBV - can it be done? since the MC seals failed could the PBV fail too ? does it have seals?
#2
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i don't know, but i've got some links
https://www.rx7club.com/1st-generati...valve-1159310/
https://www.rx7club.com/race-car-tec...-valve-945620/
https://www.rx7club.com/race-car-tec...-valve-931953/
https://www.rx7club.com/1st-generati...valve-1159310/
https://www.rx7club.com/race-car-tec...-valve-945620/
https://www.rx7club.com/race-car-tec...-valve-931953/
#3
Ah I only searched the 2nd Gen forums..
Thanks
Reading those links seems there is a good balance of going this route.
The Miata PDF install guide is great ins terms of guidance with install, bleeding and testing the balance.
It is also reversable..
Thanks
Reading those links seems there is a good balance of going this route.
The Miata PDF install guide is great ins terms of guidance with install, bleeding and testing the balance.
It is also reversable..
Last edited by mr_vaughn; 11-16-22 at 12:30 PM. Reason: more info
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