what is it

[spivvy]

:confused

i know this is a stupid question and i apologise but what the heck is this and what does it do

[John Mac]

Its called an Acceleration valve nothing to do with speed.
It works in conjunction with the Servo, the big black round thing in front of it, all to do with the braking system, sometimes also called a Pressure reducer. I think its a Saab part, I know the servo is as I had to replace mine recently

[GreenV8S]

Valve that restricts braking to the rear under heavy deceleration. Stops the rear wheels locking up when you are braking hard.

[spivvy]

Thanks guys never seen one before

[roy_allen]

You know, I was only wondering what that was the other day! Now I know. Cheers chaps!

Roy.