986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Front/rear brake balance feels wrong

JFP in PA · 08-28-2011, 08:05 AM

The front to rear braking bias is controlled by a proportioning valve system, which normally is heavily biased to the front to prevent rear brake lock up. Testing of the bias is normally done with some very high pressure (3,000 psig) specialty gauges, not something everyone has. The valve system is not adjustable, so if it is off it has to be replaced. On the early cars (ABS/TC), the valve is separate, on later cars (ABS/PSM), it is part of the stability management system.

08-28-2011, 08:05 AM	#4
JFP in PA Registered User Join Date: Feb 2005 Location: It's a kind of magic..... Posts: 6,277	The front to rear braking bias is controlled by a proportioning valve system, which normally is heavily biased to the front to prevent rear brake lock up. Testing of the bias is normally done with some very high pressure (3,000 psig) specialty gauges, not something everyone has. The valve system is not adjustable, so if it is off it has to be replaced. On the early cars (ABS/TC), the valve is separate, on later cars (ABS/PSM), it is part of the stability management system. __________________ “Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein