Wanted - Brake Pressure Reducing Valve

[rapidtornado]

try get one off MK2 fiesta, there's a link on locostbuilders, that's what I've bought cost me a tenner bolts straight into master cylinder... don't know if it will work but it's been used a lot on robin hood set-ups with discs all round

[flyerncle]

Late reply,pressure reducing personally I would avoid anything speed sensitive as it would be for a larger heavier car and possibly a problem.

[Trophy Blue]

Fiat Uno ones are available from factors very cheaply, they can be made adjustable very easily, made unadjustable for IVA, and then returned to the original state!

[kj71]

If its the ford sierra deceleration valve i have one you can have.

[Matthew]

Originally Posted by kj71

If its the ford sierra deceleration valve i have one you can have.

Thanks. I've PM'd you with my contact details - let me know what you want for it.

Matt

[Matthew]

Originally Posted by Trophy Blue

Fiat Uno ones are available from factors very cheaply, they can be made adjustable very easily, made unadjustable for IVA, and then returned to the original state!

I bought one of those (from Brakeparts, part #HRV1013), but I can't work out what I would need to do to make it work correctly - do you have the details?

That's why I was looking for the standard Sierra one - as far as I can tell it just shuts off the rear brakes when the decelleration reaches a certain rate. It may not be optimal, but seems from comments that as long as it is mounted identically to the Sierra then it is enough to pass the IVA.

Matt

[flyerncle]

Roller brake tester does not take into account deceleration only brake effort/force so could cause a fail at test/IVA.

[Matthew]

Originally Posted by flyerncle

Roller brake tester does not take into account deceleration only brake effort/force so could cause a fail at test/IVA.

Reading the IVA manual I think it's covered under Brake Performance 09E - Note 6: Decelerometer test – This method must only be used where the vehicle cannot be tested in the roller brake tester due to a design characteristic.
...
Drive the vehicle on a level road at a steady speed of approximately 20mph and apply the service brake sufficient only to obtain wheel lock. Observe whether all the wheels of the rear axle(s) lock prior to both wheels of the front axle.

Having a deceleration sensitive valve would mean that was the only way the brakes could be tested, and it's definitely a design characteristic.

Still I haven't been through the IVA so this is all theory

Matt

[flyerncle]

Decel is used for 4wd etc and has no bearing on the Sierra valve if used for the Roadster.

Every MOT station in the land has a decelerometer for 4wd.

Better to use a pressure reducer as per previous post's and alter after IVA.

[robo]

Someone on here posted on this. They fitted 4x4 sierra front calipers which are a slightly bigger piston diameter which got round the imbalance thing and it passed sva. No gadgets needed so try and keep it simple.

Bob