Catastrophic brake failure like I have never seen before

**loanrangie** · 8th March 2017, 12:43 PM

Originally Posted by DoubleChevron

Have a look in the manual and see if those caliper bolts should have thread locker on them. I seem to remember my range rover classic having thread lock on the caliper bolts when I removed them to change the front 'CVs.

seeya,
Shane L.

You wouldn't split the calipers to change cv's though.

**Jazzman** · 8th March 2017, 09:50 PM

Originally Posted by sierrafery

That split chamber thing in the master cylinder is useless as only the primary piston is moved mechanically by the rod the secondary piston's movement is achieved through fluid pressure so if any chamber goes out of fluid there will be no pressure in the cylinder... an overcomplicated construction without effect... they should have built a cylinder with bolth pistons actuated mechanically by the rod

Exactly without pressure they still will not function. No different to electronics, the fluid will take path of least resistance.... onto the ground. If for argument sake the dual circuit was working when the leak was small, that might explain why he didn't notice earlier... he sure noticed when there was no fluid left.

Unless you had 2 master cylinders too, they are not independent dual circuits.

**d2dave** · 8th March 2017, 11:27 PM

Originally Posted by goingbush

There is SUPPOSED to be a divide in the Master Cylinder so that if one circuit leaks out, theoretically there is fluid in the other circuit. Its part of the ADR's

In practice it is not the case .

Im dealing with this right now with Iveco. One fellows brake hose from master cylinder rubbed through & he had no brakes at all.

So much for Dual Circuit brakes, I also found my brakes failed totally with a broken rear brake hose on a split circuit. That is an ADR non compliance.

simple experiment , undo a brake bleeder anywhere on your car & push the pedal, if it goes all the way to the floor you have zero brakes. Makes a mockery of Dual Circuit & ADR,s

Im replacing the entire braking system on the truck with something that works.

So a 96 Defender does not have a divider in the master cyl reservoir yet a 96 Disco does.

I find this a bit strange, considering mechanically both vehicles are very similar.

Thread: Catastrophic brake failure like I have never seen before

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