Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
STOP!! Never post your email address in open forums. Bots can "harvest" your email! If you must share your email use a Private Message or use the 
smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
On the 59 TR3A the brake line goes from the master cylinder to the top of the proportioning valve. Brake lines then split to the front and rear brakes.Isn't the function of the PV to provide 60/40 braking front/rear? If so why wouldn't the proportioning valve be placed only on the outlet that goes to the rear brakes?What am I missing here? CK
-
Hey Guest!
British Car Forum has been supporting enthusiasts for over 25 years by providing a great place to share our love for British cars. You can support our efforts by upgrading your membership for less than the dues of most car clubs. There are some perks with a member upgrade!**Upgrade Now**
(PS: Upgraded members don't see this banner, nor will you see the Google ads that appear on the site.)
TR2/3/3A TR3 Brake Proportioning Valve?
- Thread starter karls59tr
- Start date
Share this page
Offline
I'm not aware of any proportioning valve on a 3A, just the residual pressure valve that keeps just the slightest pressure on the front caliper pistons to keep the pad near the rotors.
TR3driver
Great Pumpkin - R.I.P
Offline
If you mean that gizmo on top of the 5-way union, it's a RPV. And while it's function is for the front brakes, it keeps pressure in both front and rear.
The concept is that, under hard cornering, the front spindles flex enough to move the rotor sideways relative to the caliper. Without the RPV, the outside piston pushes fluid back into the MC reservoir and the pedal is low the next time you use the brakes. With the RPV, the fluid pushes the inside piston out instead.
But some people (like me) don't like having the brakes drag that much, so we disable the RPV (by removing the plunger inside).