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Using the 18/5 as an example, the numbers mean:
- Up to 18 bar of pressure, the rear brakes are fed the same pressure as the fronts
- Abouve 18, half as much additional pressure is fed the rear brakes. (i.e. 26 bar of presssure means only 22 bar to the rears)
I've changed to the 33 valve on my 951 to balance out the braking. I've yet to test it out at the track with my normal pad setup but so far I've been very pleased on the street.
The install is very easy on non-abs cars but a bit more involved on ABS cars. On a non-abs car the valve is right off the master cylinder. On ABS cars the valve is located behind the fender well lining. Remember to bleed to brakes fully after the install.
-Hugh
'86 951
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