I replaced the front brake pads. I haven’t bedded them in yet so I have no verdict on them yet and I’m still waiting for the rear pads to arrive. I got a bit giddy to fit them and I’ll bed them all in together, I won’t be using the car much this week. I did go on a very short drive and there was no brake squeal but then they haven’t been used enough to get glazed.
There are 2 methods to replace the front pads and discs.
- 2x special 13mm bolts which attach the caliper to the caliper carrier
- 2x normal 21mm bolts which attach the whole caliper assembly to the hub.
I went with the latter.
I tried the former by hammering a 13mm 12 sided socket onto the heads, tried to turn it but I could see the head deforming so I sacked this method off well before the head became unusable. I think these bolts aren’t meant to be removed and they’re special heads so people don’t mess with them.
Things you need
- The normal tools you need to remove the wheels (jack, 17mm socket etc.)
- 21mm socket and an extension for leverage
- Silicone based grease. I used LM2 grease
- Flat head screwdrivers
- Torque wrench
- Something to rest the caliper on
- New wear sensor. I got mine from GSF car parts but they come as a pair for the front even though there is only one. My old wear sensor disintegrated up on removal. Think I paid £27 all in with the rear one.
- I recommend gloves and a face mask, I blew my nose after and it wasn’t pretty
The process
- Remove the cap off the brake fluid reservoir and put a rag over the reservoir to soak up any brake fluid that could overflow when the caliper pistons are pushed back.
- Remove wheel.
- Turn the wheel to the opposite side you are working on so that you can access the 2x 21mm bolts at the back of the caliper.
- Lever out the clip that holds the brake line to the bracket.
- There is a wear sensor on the passenger side only, twist this out of its bracket and unplug it.
- Undo the 2x 21mm bolts. They’re very tight and you may need some sort of extension for leverage that fits within the confines of the working area.
- Pull the caliper off the disc, take care to guide the brake line out of the bracket and place the caliper on something so that the brake line isn’t stressed. I used a tub of paint and put a rag on top of it so that you don’t scratch the caliper. Some brake pad crap fell out of mine and scratched the paint on the caliper on one side

- With the old pads in place, use a rag to protect the caliper and use a G clamp to force the pistons back
- Use a screwdriver to lever the old pads out, no need to mess with the clips on the back of the caliper.
- Put some silicone based grease on the back of the new pads.
- Put the new pads in and installation is the reverse of taking them off.
Just remember to put the brake line back in its holder before you bolt the caliper back on and you’ll need to straighten the wheel to get the brake line clip back on.
Also the wear sensor fits on the other side of the Brembo pad (you’ll know what I mean when you fit it) so route it accordingly.
I tightened the 21mm bolts to 200nm. Pump the brake pedal to make sure it goes firm after installation.
I’ll do some instructions for the rears when I fit them, but you’ll need VCDS or something else to wind the parking brake back so it could be a non-starter for some people.
I have a BNIP, spare front wear sensor (Delphi branded) which I can sell cheap if anyone wants it. The design of the Delphi one seems better and more sturdy than the OEM one. Drop me a PM if interested.