RE: What a saga, binding rear brake - 4

Zitat von wessie im Beitrag #45

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Zitat von Sanemancured im Beitrag #44

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Zitat von wessie im Beitrag #43

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Zitat von Sanemancured im Beitrag #40

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Well, BMW OEM pads went it. It was immediately apparent that everything was good. No dragging or binding at all with new pads, unlike when I fitted the Ferodo's. I've been out for 40 miles today and everything is just as it should be. I cancelled the order for the master cylinder and I'll monitor the wear rate.

The OEM pads are far more 'sintered' looking and less 'organic'.

Fingers crossed.

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which Ferodo compound? I ordered a set of Ferodo pads when M&P had an offer for 3 for 2 i.e. the rear pads for free. They had my favoured ST compound (gold pack, HH sintered) for the front but only the black, Eco Friction for the rear https://www.ferodo.co.uk/blog/eco-fricti...er-braking.html

do you think there was something different in the dimensions or that the compound was causing drag? I know some compounds can contaminate disk rotors that can give the impression of warped rotors

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I think that size was the first issue. If only I had had an OEM set on hand to compare. The compound from memory was the more 'sintered' of the two Motorworks offered. They seemed much softer and more prone to shed material in practice. I wasn't particularly trying to save money and from now on it's OEM for me. They work well too.

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Motorworks have the standard Platinum pads (black backing plate) and the ST HH sintered (gold backing plate) so I guess you had the latter - they are very different to look at.

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Zitat von Sanemancured im Beitrag #44

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Zitat von wessie im Beitrag #43

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Zitat von Sanemancured im Beitrag #40

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Well, BMW OEM pads went it. It was immediately apparent that everything was good. No dragging or binding at all with new pads, unlike when I fitted the Ferodo's. I've been out for 40 miles today and everything is just as it should be. I cancelled the order for the master cylinder and I'll monitor the wear rate.

The OEM pads are far more 'sintered' looking and less 'organic'.

Fingers crossed.

---

which Ferodo compound? I ordered a set of Ferodo pads when M&P had an offer for 3 for 2 i.e. the rear pads for free. They had my favoured ST compound (gold pack, HH sintered) for the front but only the black, Eco Friction for the rear https://www.ferodo.co.uk/blog/eco-fricti...er-braking.html

do you think there was something different in the dimensions or that the compound was causing drag? I know some compounds can contaminate disk rotors that can give the impression of warped rotors

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I think that size was the first issue. If only I had had an OEM set on hand to compare. The compound from memory was the more 'sintered' of the two Motorworks offered. They seemed much softer and more prone to shed material in practice. I wasn't particularly trying to save money and from now on it's OEM for me. They work well too.

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An update. This may prove useful to other forum members.
The OEM rear pads have a ‘shim’ or backing that sits on the rear of the pad adjacent to the wheel. This backing is by way of a PTFE spacer held in a stainless steel case.
When I fitted the replacement Ferodo pads I was unsure as to whether the shim was to be installed with them. I looked online for this info and found nothing. I didn’t have a new set of OEM pads to compare thickness so I went ahead with refitting the shim on the back of the inboard Ferodo pad. It all fitted together without any problems.
I think on reflection that this may have been a mistake and the cause of all of my woes.
The latest OEM pads, needed because the inboard pad wore excessively, came with a new shim.
The disc is however badly and irregularity worn on it’s inside. I now need to replace the disc, bolts and
yes, the pads again.
An expensive mistake that I wouldn’t want to see repeated.
I’ve still had no official confirmation that the shim is for the OEM pads alone but it certainly makes sense. I would have liked to have seen some information from either Ferodo or the supplier to this affect.

Thank you for the update. That is good information to carry forward.
Is the rotor really very expensive? I would think it is a wear item and priced as such. But what do I know...

A Brembo replacement is slightly less than £100. The EBC version slightly more expensive.

I've just been chatting to a BMW technician online. He owns his own business. He only fits aftermarket Brembo pads, as I'm about to. He always fits the spacer.

Just when you finally thought you did it wrong along comes someone and confirms your original decision.....

Unless Ferodo should be without and Brembo should be with??

Something, somewhere needs to say because the consequences of getting it wrong are a pain in the arse and expensive.

Without wishing to drag this overlong thread on too long. I got a call from James Sherlock's who maintain BMW and supplied the Brembo sintered pads. Their mechanic advises to never fit the spacer/anti squeal plate with aftermarket pads as it causes binding issues.

So one BMW tech does and another doesn't.

I won't, and knowing this a while ago would have saved me a lot of aggro.....