3/15 rear proportioning valve help

[Rich. 0]

Hi, 

 

bit of a cheeky request :). My brother had the 205's when I was younger, an XS and GT. I only really got in to Peugeot's when I had a 106 gti.

 

I wonder if you could help another car owner of the same era. I have a 1983 Mk1 Golf that I'm in the process of finishing a conversion to an Audi 3.2 24v. Build thread if you're interested: https://vwgolfmk1.org.uk/forum/index.php?page=topicview&type=view&id=205529

 

I understand non abs pug 205 gti's ran a rear proportioning valve to stop the rear brake discs locking up. This is very similar to the Scirocco 16v's which also uses a 3/15 ratio proportioning valve.

 

I have purchased some from a 205 and the only difference is one side is M12 and the other M10. My question is the orientation of the valve, is the M12 side the feed from the master cylinder and M10 to the calipers?

 

Any help would be much appreciated as the valves don't appear to be labelled with a flow direction.

 

Thanks

Rich

Edited June 6, 2020 by Rich.

[Daniel306 12 1 Cars]

12mm from the master cylinder and the 10mm is to the caliper 

[Rich. 0]

1 minute ago, Daniel306 said:

12mm from the master cylinder and the 10mm is to the caliper 

Thank you

[welshpug 1,626]

these arent a direct proportioning valve, they rise up to a knee point then flatline at 20 bar from memory, 309 is 25 as is a zx and a certain ferrari of that era from memory, and the zx 16v is 30 bar.

[Rich. 0]

Thank you that is exactly what I require, works the same way as the mk1 late cabriolet, scirocco 16v and lotus elan M100.

Edited June 6, 2020 by Rich.

[welshpug 1,626]

interesting, dont happen to know what pressures they used?

[SRDT 150]

The 205 used two different pressure regulators, first "F" then "E". The 309 used "blank" "E", "F" and "B".

I have some pressure values for the early 309 GTI but it's not from Peugeot:

25 front --> 25 +/- 2.5 rear

40 front --> 29.5 +/- 2 rear

60 front --> 35.5 +/- 1.75 rear

[Rich. 0]

Found this whilst looking for the correct Valves:

 

http://wikilec.com/view/Brake_Proportioning_(Bias)_Valves