Hi everyone,
My Mk 3.5 has just had it’s first service (only 7,500 miles) at 12 months old and the front brake discs are corroded on the inside face. My dealer is going to skim them as a warranty claim because Mazda UK won’t allow new discs to be fitted.
I have never had corroded discs on such a new car and at such a low mileage in 40 years of motoring and I am naturally peeved.
Any comments would be much appreciated, Kind regards, Kev.
Ask to see and photograph the discs ?
could be a sticky caliper but very unusual on the front.
Is it stored outside or in a damp garage perhaps but then why the inner face?
Only solution I car suggest drive it more !
Brake discs are iron and will start rusting in a day or two if not driven. I would not worry about it.
The odd bit is why only the inner surface, it does sound like a sticking caliper and if the garage is going to skim the disk it must be badly corroded, so it must have been sticking for quite a while. Get them to check the calipers. Are they a cowboy outfit?
I’ve never worked on a Mk3, so this may be bulls**t. A pair of discs from MX5 parts is £113.90/ pair. I have seen the Mazda skimming tool in operation and the setup is quite complicated. Most garages today will fit new disks rather than skim them if asked to do so, however there is more money to be made in the skimming process, than fitting new disks…just my cynical POV
When I worked for a Bearing Manufacturer, a few moons ago, everyone who was into cars took their disks into work and had both faces ground up clean, flat and true on what was known as a Blanchard Vertical Grinding machine. It used to take about 5 minutes to grind each side up. How they did it was to place the face that the wheel is bolted to, down onto a magnetic rotary table and grind the upper face, then when it had cleaned up all the ridges etc it was flipped over onto this ground side to grind the opposite side.
Thanks for all your replies guys…it goes in Wednesday to be done so I am keen to know why it went like this so early in the car’s life. I would hate this to be a regular event.
Kind regards, as always, Kev.
If it’s only one one face it must surely be a sticking caliper. Best check it. It’s good idea to regularly do some heavy braking on a lightly used car. It’s better to wear out than seize up!
Under warranty, Mazda will always request a disc skim over a replacement where possible.