Heres a pic of my mastercylinder:


sml master cylinder

I didnt remove this from the car so am just checking something; Am i right in thinking that the 2 outlets at the end of the m/c are for the front brakes, one line to each wheel. Then the other outlet is for the rear brakes? Would there be any problem only using one of the outlets to go the the front wheels and screwing the pressure switch into the other one?

Came off a 1989 2.0 DOHC sierra.

Cheers,
David

I think you're right. Rear chamber is for rear brakes and front two should go to the front brakes - one to each port.

I can't see any reason why you can't fit the pressure switch in one port and use the other to feed both front brakes.

I have my pressure switch in one of the outlets. No problems at SVA.

I may be misunderstanding you, but if you are going to connect both front brakes to one outlet I think this would be dangerous as you would be doing away with the split circuit to your front brakes.

This would mean if something failed in that circuit you would loose both your front brakes.

If you are just putting the pressure switch in line with one of the front circuits this would be fine.

I put mine in the rear circuit for ease of mounting.

Whitestu - Not true.

The split is achieved by using the ports at the front (one or two) for one circuit and the single port at the rear for the other circuit.

The two ports at the front of the m/cyl' are connected to the same chamber and hence are part of the same circuit.

My pressure sensor is connected in series to the rear line. front 2 ports of m/c straight to front brakes.

Maybe you have a different sender to me?

Thanks gents.

I will probably put my pressure sensor inline rather than into the MC (theres no reason i cant think of why you cant because the threads are the same, and pressure is equal throughout a fluid etc).

David

PS anyone got a level sender/cap to fit the resevoir?

Just as an aside, why do Ford split the Sierra fronts into two from the master cylinder, yet only one to the rear when the pressure is equal?

Phil

Probably a packaging issue (it's just easier for piping and machining) but there's also the plumbing for the G-valve to consider.

The G-valve reduces the pressure to the rear wheels during decel's and has to affect BOTH rear wheels hence single line to the rear, then the G-valve, then the split to both rear brakes.

Just my guess.