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14th March 2024, 23:14 | #1 |
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Rover 75 Saloon & Tourer Join Date: Mar 2013
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Quick answer please
Doing a rear brake pad change on my Contemporary SE and first tried to remove the guide pins since this is the quickest method. I've a wide range of allen keys but I'm stumped with what size fits the pins - it's smaller than 8mm and none of my imperial selection seem to fit - what the blazes size is it?
I've now got the rear O/S free by removing the two calliper mounting screws but would like to dismantle the guide pins. Both O/S pads are equally about 1/2 worn but I'm changing the rears because a) the December MOT advised "rear pads low" b) the N/S started to make a scraping noise I'll soon know for sure but I'm expecting the N/S pad(s) to be unequally worn, is there a common reason for this? |
15th March 2024, 06:22 | #2 |
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The pins are 7mm hex like many BMWs. The calipers wear eventually and the pistons stick, although in my experience I wouldn't say it was common. Spray some WD40 under the rubber before you try to push the piston back.
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15th March 2024, 06:34 | #3 | ||
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Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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The piston circumference can become dirty or rusty thus increasing friction and the sliding surfaces of the caliper do corrode as they're unfinished cast iron. A small difference in pad wear should not be a cause for undue concern. Simon
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18th March 2024, 09:34 | #4 | |
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Quote:
Do we clamp-off the brake lines (mine seem a bit too solid to compress..?) or just drain down/release pressure from the bleed nipple and then do bake fluid recharge...? |
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18th March 2024, 09:55 | #5 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
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You can use the Haynes recommendation of unscrewing the master cylinder cap and placing a sheet of plastic over the top of the filler neck then refitting the cap. This will stop the application of atmospheric pressure to the fluid in the reservoir with the result that it stays put! I find that this method works really well. When your repair work is complete you will, of course, be bleeding the rear brakes anyway. Thanks for posting the update. I wonder how the piston seal became damaged? Simon
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