Just a quick question to put my mind at ease.
I bought a new set of rear pads and when fitting them found that one of the shims had rusted away and broke up when I removed the old pad.
I have refitted the old pads and am going to get new shims tomorrow.
A quick internet search refers to the shims as anti-rattle or squeal.
I am therefore hoping the car is safe to drive? 80 mile round trip tomorrow.
They are Lucas brakes on a 2.0 Xreg if that makes any difference?
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I wouldn't have thought that it would cause you any problems in the short term. Make sure that it is fixed though asap.
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Should be fine on a temporary basis, hope you used a nice lot of Copperslip on the top and bottom of pads. If so, you shouldn't have a problem before the shims are re-fitted.
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Thanks for the advice.
I was pretty sure it would be temporarily OK.
I have changed around 10 sets of pads over 15 years and they have always been included or the ones on the car in good condition.
Yes, I did put some copper slip on the pads and on the face of the piston.
Hopefully Nissan will have the shims in stock and changing the rear pads is quite an easy job on the P11-144, so should be able to do before it gets dark.
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The shims are there for anti-squeal purposes. They do not affect the functioning of the brakes. They are normally only a couple of quid per set.
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>>one of the shims had rusted away and broke up
It wasn't doing much good then, so you probably won't miss it.
In my experience, these things are just that, anti-rattle shims, although they can put, effectively, a bit of 'toe out' on the pad that can change the 'feel' of the brakes, and maybe prevent 'grab', similar to the self servo effect of old twin leading shoe drum brakes.
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>>a bit of 'toe out' on the pad that can change the 'feel' of the brakes, and maybe prevent 'grab', similar to the self servo effect of old twin leading shoe drum brakes.
As Aprilia has said, they are an anti-squeal device.
Number_Cruncher
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although they can put effectively a bit of 'toe out' on the pad that can change the 'feel' of the brakes and maybe prevent 'grab'
How would it do that? The pad would soon wear flat to the disc and any 'toe out' would be lost.
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£8 something for 4 shims from Nissan.
Of course the brake I hadn't taken off at the weekend was the most awkward one.
I just about managed it before dark though.
Thanks again for the advice.
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>>How would it do that? The pad would soon wear flat to the disc and any 'toe out' would be lost.
The pad would wear flat to the disc, but the pressure would still be applied unevenly across the pad because the piston still pushes out square to the caliper bore.
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The pad would wear flat to the disc but the pressure would still be applied unevenly across the pad because the piston still pushes out square to the caliper bore.
No it wouldn't. Think about it. Once the friction area had worn so it was parallel to the disc the pad backing (with shim) would rest at a slight angle to the piston, but in contact with it both sides (because of the shim). The pressure is only applied unevenly until the pad has worn parallel to the disc. In any event, the shim usually (but not always) covers the whole area contacted by the pad.
The shim is not there to change how the pad contacts the disc, it is there as an anti-squeal measure.
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