A45 Front Disc at 9000 miles

[Revo]

Just been told font discs and pads has to be replaced at 9000 miles even though the car is driven like miss daisy 95% time, never been on a track day, local dealership tells me not covered under car warranty for god sake! less than three year old and 9000 mile, performance car that should be designed to brake hard and discs are shagged.£661.00 to replace would i be better putting another make of discs and pads on??? any advice greatly received.Spencer

 

[Abb]

I would be getting a second opinion!

 

[oldguy57]

Just been told font discs and pads has to be replaced at 9000 miles even though the car is driven like miss daisy 95% time, never been on a track day, local dealership tells me not covered under car warranty for god sake! less than three year old and 9000 mile, performance car that should be designed to brake hard and discs are shagged.£661.00 to replace would i be better putting another make of discs and pads on??? any advice greatly received.Spencer

Always a nice little earner for an MB dealer "you're discs and pads need replacing sir". Could be right of course and no warranty will cover this usually. As Abb says get another opinion. MB quoted £2200 for the front discs and pads on mine, so it could be worse!

 

[ShaunB]

I would be getting a second opinion!

So would I, it sounds like bollox

 

[Bobby Dazzler]

Just been told font discs and pads has to be replaced at 9000 miles even though the car is driven like miss daisy 95% time, never been on a track day, local dealership tells me not covered under car warranty for god sake! less than three year old and 9000 mile, performance car that should be designed to brake hard and discs are shagged.£661.00 to replace would i be better putting another make of discs and pads on??? any advice greatly received.Spencer

Based upon what you’ve said, it does seem premature, especially if you have owned the car from new and therefore know how it’s been driven it’s whole life. However without checking prices for your model, I would say that at £661 that seems like a fair price.

Did the dealer actually say they’re $h4663d or did they say they are xx% worn and so will need to be replaced before the next service? Either way you might as well wait for the brake wear warning light to illuminate, as long as you don’t mind the inconvenience of going back another day.

 

[Will]

Pads I could possibly understand but what’s wrong with the discs? Ask for the measurements.

Some AMGs have quite thin amounts of friction material - eg rear pads on my GL63 are only 9.75 from new and the wear limit is 2mm - so an absolute maximum of just 7.75mm of usable material. In reality the warning light would come on at 2-3mm so if it’s down to 4 or 5mm I suspect they’d recommend replacement during a service to save a trip for pads on their own at a later date (also no doubt some financial interests of course!)

You’d need to check the spec for your own brakes but in the example I mention they could be advising they’re worn at say 4 or 5mm (before the light comes on) but then they would have only worn down maybe 4-4.75mm from a new set.

Look up the spec for your own pads and ask for the disc and pad measurements (they should be doing this on the service)

Don’t forget also that on your model (4WD) the front pads will possibly wear quicker due to the traction/stability systems (braking wheels to aid traction etc) which you maybe don’t think about, not just the manually applied braking.

 

[Hakon]

Generally if discs are grooved, the manufacturer cuts the groove to the minimum thickness.

I've had at leat 4 MB 'health reports' on my car this year. The assessment of my front discs and pads between the techs and dealerships is staggering.

 

[ChipChop]

There will be a thickness limit on brake discs, ask the dealer what the disc thickness has been measured at to justify the need for replacement.

 

[flowrider]

You just missed the 50% off sale on Autodoc but when it comes back on buy a set of disks and pads and replace yours when the pad sensor comes on. I just bought Brembos for my Audi S5 £150 delivered.

 

[KennyN]

According to this , they should be 32mm new and 30mm minimum thickness.

MERCEDES A45 AMG CLA 45 GLA 45 AMG FRONT BREMBO BRAKE DISCS & BREMBO BRAKE PADS | eBay

1 x FRONT BREMBO BRAKE PADS SET 2 x FRONT BREMBO BRAKE DISCS [350mm] 5 STUD DISC TYPE: VENTED STYLE: DRILLED SLOTTED (GROOVED) BRAKE DISC THICKNESS: 32 mm MIN. THICKNESS: 30 mm CENTRING DIAMETER: 67 mm OVERALL HEIGHT: 51 mm WHEEL HUB: 15.3 mm FOR BRAKE DISC DIAMETER: 350 mm NUMBER OF MOUNTING...

www.ebay.co.uk

Get yourself a set of these and measure your "worn" discs and take it from there with the dealer and if they admit the discs will be fine for a bit longer then take your cars elsewhere or DIY and safe a few £££.

Digital Caliper Brake Disc Thickness Measuring Tire Tread Depth Gauge Set 0-60mm | eBay

Find great deals for Digital Caliper Brake Disc Thickness Measuring Tire Tread Depth Gauge Set 0-60mm. Shop with confidence on eBay!

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K

 

[Atavus]

I just replaced pads on the rear of mine. You have to expect them to try to get you to do the discs. Most discs are knackered by about 2mm of wear and they often say ‘you only have 1mm of life left’.

 

[Revo]

Thank you to all that spent time to reply,
The reason which I've know seen I didn't mention was there's a judder when braking more at speed, I thought it was from the back but the test report give to me show its from the front right.A worked disc.

 

[Deleted member 149005]

Low mileage, sitting around a lot of the time...getting wet and rusty...

 

[Deleted member 149005]

Thank you to all that spent time to reply,
The reason which I've know seen I didn't mention was there's a judder when braking more at speed, I thought it was from the back but the test report give to me show its from the front right.A worked disc.

That’s why you need new discs then...

 

[Will]

Or pit stop £5 drive through car washes - jet wash straight onto hot discs

 

[Hakon]

I thought the general consensus was that warped discs were more a historical issue and that modern manufacturing virtually negated this.
With judder more realistically attributed to uneven deposits building up on the disc surface, whether it be pad resin or something else.

 

[Fununcle]

I thought the general consensus was that warped discs were more a historical issue and that modern manufacturing virtually negated this.
With judder more realistically attributed to uneven deposits building up on the disc surface, whether it be pad resin or something else.

I recently had the disks replaced under warranty due to warping, I doubt they would if not actually warped.

 

[Deleted member 149005]

With judder more realistically attributed to uneven deposits building up on the disc surface, whether it be pad resin or something else.

From low use?

 

[Hakon]

From low use?

Yup, I'd guess the brakes are still applied in a low use as well as high use scenario.

 

[Deleted member 149005]

With little opportunity for the dust to be liberated by air flow...