Page 3 - Valve Identification Guide

In 1969-70 a third valve was added to correct problems from the previous years. This valve now went in the rear line
to restrict pressure to the rear because rear drums were now locking up before the front brakes were even activated.
By 1971 GM had all the problems worked out and combined all these valves into one valve that is now called a
proportioning valve.

In 1971 the three 1970 valves to the left were combined and superseded by the valve to the right. This valve gives
70% of the stopping power to the front brakes and the remaining 30% goes to the rear drums. This valve is
proportioning fluid and has corrected all previous braking problems.

This set up on the left is from a 1970 Camaro and the valve on the right is from a 71 Camaro. Again the mess on the
left is replaced with a one piece proportioning valve. When looking to put disc brakes on any car the valve to the right
which is available new at Inline Tube is the way to go.

In the 70's these valves were made in both the cast iron and brass. The cast part did not hold up very well to the
elements, the brass valves clean up nice and are easily reused. This valve was used on most GM cars up until 1981
and is also available new from Inline Tube. (pictured to the left)

V a l v e I d e n t i f i c a t i o n P a g e 3 | 4