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And I did not even know they existed (knew about VOSA Station) until yesterday when I found This
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That's it - you've got it. Obviously it does take a bit of extra time making a separate test appointment, rather than bunging the vehicle in the garage for a service AND mot. But I do it for the reasons previously stated.
Oh, and somebody mentioned £650+ pounds for a main dealer service - thankfully, never had to pay anything like that so far. We're fortunate in Bristol; in addition to the big glossy main franchise Citroen dealers with their fancy showrooms, there is an excellent 'backstreet' specialist, where everybody is passionate about servicing Citroens. And because the main dealers can't handle the demand for servicing the brand, the little garage (which doesn't sell cars or vans, only services them) managed to secure 'Approved Citroen Service Centre' status. So they can do all warranty work etc and provide a proper 'Citroen' stamp in the service book. But, over and above the advantage of their enthusiasm and expertise, they only charge in the region of 50% of the big dealers. The premises are a bit ancient and scruffy, but I never fail to be impressed with their attention to detail - we've got 2 cars they look after. Only wish the MH was Citroen-based.
Oh, and in case it's of interest to anybody, it's: Chandler Motor Company Ltd, in St Phillips, Bristol
Hi Bill,
Have to disagree with your comment "disc runout knocks the pads back". The valving in the master cylinder releases the pressure when you come off the brakes, and this allows the pistons to move back sufficiently to allow the disc to rotate freeely. The disc must be set up to run true, otherwise you will experience judder during braking.
The heavy and hard brakers tend to keep thier brakes free mainly due to the excessive heat generated. Also they wear their brakes out much quicker therefore they get checked and replaced more often.
Teemyob's disc wear is typical of a caliper with the piston(s) on one side only, where the piston(s) pushes the outside pad onto the outer face of the disc. This then pulls the caliper body with the other pad attached over to the inner side of the disc.
Gentle braking and low milage allows the caliper to seize on the sliding mechanism so only the outer pad is doing the braking. There is insufficient movement on the inner pad to keep the disc clean and the results can be seen in the earlier post pics.
Sorry I disagree with you as there is nothing in any hydraulic braking system which sucks, pulls or pushes the pads and pistons back when you take your foot off the brake.
I agree that "excessive" lateral runout will cause judder but we are talking about a few thou for legitimate runout.
Didn't say there was Bill, just the simple act of releasing the pressure in the master cylinder allows the piston to move back sufficiently to allow the disc to move.
Our GT4 race car runs carbon front discs and they "float" on the hub to ensure there is no runout. This system is common on most high performance cars now with 4 and 6 piston calipers.
I guess we will have to agree to disagree on this one.
Looks like a stuck sliding mechanism. One pad is in contact with piston that will push pad onto disk when pedal is pressed. The other side only gets pressure from the bending of the mount.
Not very nice weather to do this outside at the moment. But it would probably take an hour per side to free off the sliding pins. Then, as long as the screw holding the disc on comes out about 30 mins to change disc and pads.
As far as I am aware most cars have a return spring on the brake pedal or on one of the linkages between the pedal and the master cylinder. This will return the master cylinder piston back to the normal position. It will not really 'pull' the brake calliper pistons back. I believe that the reduction in pressure will allow the pads to slide back very slightly due to the friction with the discs.
Remember that pads are 'virtually' touching the discs all the time so they don't move much at all really.
If the vehicles brakes pass the full brake roller test ...then the examiner can not fail the discs just because they look like that ... only advise
I understand that they do need changing & the caliper slide pins need freeing off / lubricating to help to prevent it happening to the new discs.
The mot is a safety check ... some examiners think components should fail the test just because it would be ideal to change them on a service !
ps. They would have failed the old test under 'excessive corrosion / pitting' but vosa changed it because although the discs look horrible they proberly still work ok.
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Re: MOT
