Disc Brake Plumbing - Master Cylinder

[Spikehaus]

Hi Gents

Does anyone have a schematic for the brake pipe plumbing for a disc brake arrangment. I was looking at my sierra master cylinder and could not figure out why it has three outputs? Which one goes where?

I have the tee peices, pressure switch and a bias valve. I have also fixed the flexi pipes and and fitted the copper pipes the rear tee. Should the bias valve be located near the master cylinder?

[Bonzo]

Hi Nick

On the Sierra master cylinder with Three outputs you'll have Two at the front & these have a line to each front wheel.
The rearmost output goes to the rear brakes.

If you are talking about the standard Sierra inertia valve, this was mounted to the front nearside inner wing.
I believe the angle that this is quite critical, perhaps someone using one will provide some more detail

[Spikehaus]

Originally Posted by Bonzo

Hi Nick

On the Sierra master cylinder with Three outputs you'll have Two at the front & these have a line to each front wheel.
The rearmost output goes to the rear brakes.

If you are talking about the standard Sierra inertia valve, this was mounted to the front nearside inner wing.
I believe the angle that this is quite critical, perhaps someone using one will provide some more detail

The two at the front being one on the side and one on the underside on the cylinder? Should the tee piece for the brake pressure valve be tapped off one of the front pipes or the rear brake line?

The bias valve I have is Willwood, can I use this on a road car? Will I need a pair of residual pressure valves on the rear?

[flyerncle]

The pressure reducer is used to stop the rears locking before the fronts,ideal brake distribution is 60/40 front to rear.

As Ronnie said the valve is fitted to n/s on the Sierra and feeds the rear system,if the Wilwood is adjustable it will not pass iva.

You may be better off fitting an inline valve from a Corsa or Mondeo from the rear brake pipes close to the cylinders.

(Corsa one's are fitted near battery)

Fit this in the feed to the rear and I personally will fit the pressure switch to this line for the brake lights.

Hope it makes sense.

[Bonzo]

Your's is probably like mine



I believe the front pair are used only for the front brake lines.
not to familiar with bias set ups but I would imagine any bias equipment would be plumbed into the rear brake system only ( Just a gut feeling as it is the rear brake effort being controlled )

Sure some will give you a precise answer on this one

[Spikehaus]

Originally Posted by Bonzo

Your's is probably like mine



I believe the front pair are used only for the front brake lines.
not to familiar with bias set ups but I would imagine any bias equipment would be plumbed into the rear brake system only ( Just a gut feeling as it is the rear brake effort being controlled )

Sure some will give you a precise answer on this one

All makes sence now, thanks chaps, I guess today when I was looking at it I was easy distracted and happier cleaning the workshop than acually doing any work. At least the kit car show next weekend (Visiting Sat Lunchtime if anyone else is going) should give me another building burst and some motivation.

[flyerncle]

Interesting,mine has no switch and sits level but I will have to space it out to make room for the rod as it very close to the pedal.

Any pressure reducing should be done to the rear and not the front and the dual circuit system works by feeding the front from the two at the front of the cylinder and one feed to the rear.

Adrian fitted different diameter cylinders to get the correct reduction but this is not an option with discs.