Where to find 3/20 proportional valves?

[MMamdouh]

i managed to lock the rear brakes again on the same downhill road and this is worrying me... i need 3/20 proportional valves badly

anyone where i can find them??

MMamdouh

[MMamdouh]

any ideas??

MMamdouh

[Daniel]

Hi MM,

I looked on various forums and sites in French (GM / Opel / Vauxhall /...) but not find the brake compensators you are looking for. Why not adjustable brake proportioning valves?

Take care,

[gse_turbo]

what master cylinder are you using?

[MMamdouh]

Hi MM,

I looked on various forums and sites in French (GM / Opel / Vauxhall /...) but not find the brake compensators you are looking for. Why not adjustable brake proportioning valves?

Take care,

they are not available here in Egypt so i thought i'd look for the OEM part that would do the job before searching for an aftermarket part

MMamdouh

[MMamdouh]

what master cylinder are you using?

OEM Daewoo lanos master

MMamdouh

[gse_turbo]

i'm not familiar with what the 3/20 refers to but you need that one specifically?

can any of the GM masters for all wheel disc work for you? was Saab sold in Egypt in the late 90's?

[MMamdouh]

this is what i found out and posted in another thread:

2 hours of searching on the internet... finally understood the numbers marked on the P valves

http://jenniferandjon.com/ABRacing/inde ... &Itemid=48

3 refers to the proportional increase in rear pressure compared to front... in our case it is 3 bar increase in rear pressure for every 10 bar for the front... this will reflect the inclination angle on a graph showing the relation between front and rear brake pressure

20, 30 & 40 refers to the pressure at which the proportioning starts... 20 refers to 20 bar, 30 refers to 30 bar and so forth, this will identify the knee point on a graph showing the relation between front and rear brake pressure

in my case this means i am stating the proportional effect at 441PSI of brake pressure whereas i should be starting that at only 294PSI... also at 500PSI front brake pressure i am getting 100PSI more than required to the rear brakes

now i got to figure out which component of the P valve affects which characteristic... does the valve port affect proportioning value and the spring strength affect where proportioning effect starts??

MMamdouh

unfortunately Saabs are not sold here... and the Vectra versions that got similar brakes setup had ABS and accordingly the brakes master got no P valves at all.

MMAmdouh