PNM engineering rear brake calipers

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Re: PNM engineering rear brake calipers

Postby epipete » Fri 02.10.2015, 03:15

Denny wrote:Just for clarity; do they fit standard hubs with 15" or 16" wheels without modification?


Picking up on Denny's original question, with a standard (OEM) configuration of hubs, disk etc will these PNM rear brakes fit as a direct swap for the originals, is there a cable routing issue and do the instructions come in Greek?

PNM contacted me yesterday, Peter is back in on Monday and they can rush me a set out if I order soonest.

Thanks

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Re: PNM engineering rear brake calipers

Postby Rice crispy » Fri 02.10.2015, 07:42

I have a set on original hubs and they fitted fine I believe. My mechanic friend who did it didn't mention any problems other than routing the handbrake cable
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Re: PNM engineering rear brake calipers

Postby Jon » Fri 02.10.2015, 08:04

Just thought it might be worth while summarising from this thread everyone who has commented on the custom hubs with the PMN rear kit - seems like everyone except Cliff has had a problem with the disc touching the calliper, whilst he only had a bolt length issue:

Muley - (Bobs hubs) carrier 1mm too close to the disc and rubs (may have thicker washer? 1mm skimmed of disc)
Cliff - (Bobs hubs, Mintex discs) calliper bolts 2mm too long and contacted discs - fixed with 2mm washer
GeoffSmith - (Bobs pre-production hubs, Pagid 10mm disc) discs touched inside calliper, added 2.5mm spacer to centre disc
FredJohn - (Mintex disc) discs touched inside calliper, skimmed inside of disc by 1.5mm

If anyone has addition experience/info please feel free to extend/correct.
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Re: PNM engineering rear brake calipers

Postby tb10 » Fri 02.10.2015, 09:23

Jon wrote:Just thought it might be worth while summarising from this thread everyone who has commented on the custom hubs with the PMN rear kit - seems like everyone except Cliff has had a problem with the disc touching the calliper, whilst he only had a bolt length issue:

Muley - (Bobs hubs) carrier 1mm too close to the disc and rubs (may have thicker washer? 1mm skimmed of disc)
Cliff - (Bobs hubs, Mintex discs) calliper bolts 2mm too long and contacted discs - fixed with 2mm washer
GeoffSmith - (Bobs pre-production hubs, Pagid 10mm disc) discs touched inside calliper, added 2.5mm spacer to centre disc
FredJohn - (Mintex disc) discs touched inside calliper, skimmed inside of disc by 1.5mm

If anyone has addition experience/info please feel free to extend/correct.


That's very helpful indeed Jon. Thanks for detailing that so succinctly.

regards

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Re: PNM engineering rear brake calipers

Postby elanman610 » Fri 06.11.2015, 07:59

For anyone who is struggling with this or thinking of buying a PNM kit but is reluctant because of the issues with this Bob Brown hub, PNM can now supply a 256mm rear disc (11mm thick) for the PNM rear caliper kit and Bob Brown hub which looks a perfect fit for the calipers.

It is ONLY for the Bob Brown hub conversion and PNM setup and will not fit a standard Elan.

The discs are £19.95 + VAT each.
It's recommended to change the pads too (arounds £15) although the original PNM profiled pads do fit but have a smaller pad area on the larger disc.

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Re: PNM engineering rear brake calipers

Postby Fredjohn » Fri 06.11.2015, 12:24

This is great news and thanks to PNM for sorting it. Could you please just clarify 3 things:

1) It fits the recent hub kit done by Jeemy. (presumably this was a copy of Bob Brown's but just want to be clear)

2) It addresses 2 issues:

a) pad overhang being reduced/eliminated
b) it centres the disc between the two caliper halves. (the Mintex disc I used had 0mm and 2.5mm clearance, so needed either 1.25mm off the disc or a 1.25mm spacer)

Many thanks
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Re: PNM engineering rear brake calipers

Postby elanman610 » Fri 06.11.2015, 15:53

This is great news and thanks to PNM for sorting it. Could you please just clarify 3 things:

1) It fits the recent hub kit done by Jeemy. (presumably this was a copy of Bob Brown's but just want to be clear)

If it is the same as the Bob Brown hub then there shouldn't be a problem.
If anyone can send PNM one, it can be checked.


2) It addresses 2 issues:

a) pad overhang being reduced/eliminated

Pad overhang is no longer an issue on any Elan rear kit that is supplied. The pads are profiled by Pete so there is no overhang.
If anyone has an overhang now (a few of the early kits were supplied without the profiled pads which Pete is happy to modify for them) Alternatively, a new set can be bought which are profiled.
With this disc being 256mm, it is big enough so the standard pad fits with no overhang and no need to profile (hence the cheaper cost for the pads).


b) it centres the disc between the two caliper halves. (the Mintex disc I used had 0mm and 2.5mm clearance, so needed either 1.25mm off the disc or a 1.25mm spacer)

Not aware of this issue. Didn't look to be a problem on the kit fitted with the new disc.
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Re: PNM engineering rear brake calipers

Postby basher » Wed 17.02.2016, 19:02

I had a quick question on the PNM rear calipers, can anyone tell me, if I go for the ones that fit the 16 inch wheel, are there any issues with the spare tyre not fitting?
I have the vectra calipers conversion on the front and the spare won't go on, I just wanted to check that isn't the case on the back too if you go PNM otherwise I 'll have to find a alternative or go without.

Thanks in advance for any help..
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Re: PNM engineering rear brake calipers

Postby Fredjohn » Wed 17.02.2016, 19:14

I have the PNM rear brake conversion for the 15" wheel and the spare does not fit over it, nor does it fit over my front Wilwoods.

Pretty safe therefore to assume it won't go over the 16" either.

I have ditched the 14" spare and carry a regular 15" wheel in the boot.
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Re: PNM engineering rear brake calipers

Postby alan e » Wed 17.02.2016, 19:21

Fredjohn wrote:I have the PNM rear brake conversion for the 15" wheel and the spare does not fit over it, nor does it fit over my front Wilwoods.

Pretty safe therefore to assume it won't go over the 16" either.

I have ditched the 14" spare and carry a regular 15" wheel in the boot.



I have PNM fitted on the rear and hi spec on the front i carry a spare RAC card. :lol:
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Re: PNM engineering rear brake calipers

Postby epipete » Wed 17.02.2016, 20:33

Fredjohn wrote:I have the PNM rear brake conversion for the 15" wheel and the spare does not fit over it, nor does it fit over my front Wilwoods.

Pretty safe therefore to assume it won't go over the 16" either.

I have ditched the 14" spare and carry a regular 15" wheel in the boot.


This is probably a pretty stupid question but does the replacement 15" wheel fit in the wheel recess (I accept it will be deeper/wider but I'd expect the diameter to be the same)?
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Re: PNM engineering rear brake calipers

Postby Fredjohn » Wed 17.02.2016, 21:20

epipete wrote:This is probably a pretty stupid question but does the replacement 15" wheel fit in the wheel recess (I accept it will be deeper/wider but I'd expect the diameter to be the same)?


Not a stupid question Pete. No it doesn't fit: the diameter is about 2" too large. Even by deflating it, it wouldn't fit. The rolling radii of the std wheel and the spare are different. I expected them to be the same but they aren't. By removing the small spare and associated bits, putting the std wheel upright (in a plastic bag!) I still have enough luggage space for 2 for a 10 day holiday. Probably for 2 weeks too!

The alternative is either breakdown cover, which I have, or an aerosol puncture repair kit.
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Re: PNM engineering rear brake calipers

Postby basher » Thu 18.02.2016, 00:09

Thanks for responses, I had a feeling that was the case.
Any chance that another space saver will fit with 4x100 PCD perhaps with large offset? I don't really fancy not having a spare at all..
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Re: PNM engineering rear brake calipers

Postby epipete » Thu 18.02.2016, 07:16

Fredjohn wrote:
epipete wrote:This is probably a pretty stupid question but does the replacement 15" wheel fit in the wheel recess (I accept it will be deeper/wider but I'd expect the diameter to be the same)?


Not a stupid question Pete. No it doesn't fit: the diameter is about 2" too large. Even by deflating it, it wouldn't fit. The rolling radii of the std wheel and the spare are different. I expected them to be the same but they aren't. By removing the small spare and associated bits, putting the std wheel upright (in a plastic bag!) I still have enough luggage space for 2 for a 10 day holiday. Probably for 2 weeks too!

The alternative is either breakdown cover, which I have, or an aerosol puncture repair kit.


That's a bit of a buggeration - I sold 4 wheels (almost gave them away and then the b'std never paid the postage!) before I came out should have kept one - hindsight has 20/20 vision :bonk:
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Re: PNM engineering rear brake calipers

Postby Rice crispy » Tue 23.02.2016, 19:49

Just been checking over the car today and I have a leak from the offside rear caliper :(. I had an issue back at the start of the thread when they were new and PNM replaced it straight away but he's got to check if he still has any of the original ones as he now uses different ones apparently. Can anyone confirm if I can just go and get a standard golf mk 4 caliper if PNM can't help.
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Re: PNM engineering rear brake calipers

Postby alan e » Tue 23.02.2016, 20:26

You have to ask yourself why they are now using a different caliper?
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Re: PNM engineering rear brake calipers

Postby Rice crispy » Wed 24.02.2016, 00:25

Will see what he says tomorrow
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Re: PNM engineering rear brake calipers

Postby Rice crispy » Thu 25.02.2016, 00:21

Been having a search tonight and it appears it's a common issue for the golf mk4 calipers to leak around the handbrake arm and there is conflicting details around whether a refurbishment kit has the parts to do the handbrake. Will talk to PNM tomorrow
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Re: PNM engineering rear brake calipers

Postby Rice crispy » Fri 26.02.2016, 19:19

Spoke to Peter today and he is going to rebuild the caliper that I sent back a couple of years ago and send it to me. I will return the caliper from my car as he wants to see what has failed so quickly. He is doing it for free which I think is a great gesture. So hopefully next week I will have the refurbished one back and on.
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Re: PNM engineering rear brake calipers

Postby alan e » Fri 26.02.2016, 19:36

Good news and good service from PNM
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