Brakes Problem

[10G]

Just replaced the master cylinder after 2 mechanics & myself tested the pedal and found that if we keep our foot on the pedal, it will eventually go to the floor.

Well, with a new master cylinder fitted, I have exactly the same problem. Push hard on the brake pedal and leave your foot on it, your foot eventually goes to the floor.

I've got new extended rubber brake lines as I have a 3" lift.

There's no loss of brake fluid.

Is this a Patrol 'thing'? I wouldn't have thought so.

Thanks for any help.

[threedogs]

Try teflon braided lines they cant expand like rubber will

[10G]

Yeah, I'm thinking that TD.

[Turtle_au]

How old is brake fluid? Is engine running (vacuum for booster)? Drum or disc brakes? Rear proportioning valve (load sense)?

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[10G]

Fluid is new as all hoses were replaced in the last 6 months. discs all round. Doesn't have rear prop valve.

[BillsGU]

Bleed / test the LPV. Every mechanic (even brake specialists) miss that.

[JME_GU]

Bleed / test the LPV. Every mechanic (even brake specialists) miss that.

What's an LPV?

[Touses]

What's an LPV?

Load Proportioning Valve. It regulates the amount of "braking" in the rear of the vehicle, depending on load.

[Turtle_au]

Load Proportioning Valve. It regulates the amount of "braking" in the rear of the vehicle, depending on load.

It has a lever arm that changes the rear brake pressure depending on the height of the rear suspension. That should be adjusted when a suspension lift is done, otherwise it will always think there is no weight on the rear and your rear brakes will be doing nothing.

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[dom14]

Just replaced the master cylinder after 2 mechanics & myself tested the pedal and found that if we keep our foot on the pedal, it will eventually go to the floor.

Well, with a new master cylinder fitted, I have exactly the same problem. Push hard on the brake pedal and leave your foot on it, your foot eventually goes to the floor.

I've got new extended rubber brake lines as I have a 3" lift.

There's no loss of brake fluid.

Is this a Patrol 'thing'? I wouldn't have thought so.

Thanks for any help.

You can sometime end up damaging the master pump by manual depressing of the brake pedal to bleed the system(pressing it all the way to the bottom), but that usually happens with a used master pump, where the seals are already weaker.

How did you bleed the master pump, etc?