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red squirrel

Member Since: 10 Feb 2016
Location: Perth & Kinross
Posts: 2

2007 Defender 90 Puma 2.4 SW Cairns Blue

Rear brake problem - any ideas

Rear brake discs both appear to have surface corrosion even after several emergency brakes. They do not return to the shiny state I would expect after normal braking. There is no difference between left and right rear discs but a big contrast with the front discs. I suspect either Pressure Control Valve or Master Cylinder? Any thought please? (Rear disc and, for comparison. front disc pics attached)

Click image to enlarge

10th Feb 2016 1:13pm

williamthedog

Member Since: 29 Dec 2012
Location: south wales
Posts: 3441

Think I would go for a set of discs and recon or new calipers

10th Feb 2016 1:30pm

red squirrel

Member Since: 10 Feb 2016
Location: Perth & Kinross
Posts: 2

Thanks for the idea...it had new calipers and discs fitted in July last year so am assuming they are not the cause.

10th Feb 2016 1:37pm

Happyoldgit

Member Since: 14 Sep 2007
Location: Norfolk
Posts: 3471

2015 Defender 110 Puma 2.2 USW Corris Grey

I'd get it on a brake tester. Steve.
Owned numerous Land Rover vehicles of all shapes and sizes over the decades.
Current Defender: A non tarts hand-bagged Puma 110 XS USW.

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10th Feb 2016 4:19pm

miker

Member Since: 13 Sep 2015
Location: Surrey
Posts: 1766

Or jack a rear wheel up, have an assistant apply the brakes and see if you can turn the wheel. Often you have to apply the brakes really hard to get any decent braking force out the rears. Especially when unladen, the bias valve will reduce the braking force to the rears.

10th Feb 2016 4:25pm

Supacat

Member Since: 16 Oct 2012
Location: West Yorkshire
Posts: 11018

2013 Defender 110 Puma 2.2 XS DCPU Keswick Green

williamthedog wrote:
Think I would go for a set of discs and recon or new calipers

Without diagnosing the root cause? Seems an expensive and haphazard way to go.

Have a look at the rear pads on both sides of the caliper, are they equally worn? Also, are the inside faces of the rear discs as equally rust stained as the outer faces?

Do you have any old pads? If you can get a set, swap them out and have someone operate the foot pedal whilst you watch the caliper to see if the pistons have a full free range of movement. You can use a block of wood if you have no old pads - it's just something to limit the piston movement range and stop them coming out too far or falling out completely. Try to see if you can push them back in fully by hand, it should not be too easy but equally it should feel smooth and consistent.

Your issue could also be with the fluid getting to the caliper. Is the condition of the flexible hoses good, no leaks, bleed nipple clean and air tight?

11th Feb 2016 9:51am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17478

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

The pistons could be sticking in the rear calipers. Try pushing the pistons back in the bores and assess how easily they move.

11th Feb 2016 10:06am

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