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Old 11-22-2017, 06:38 AM   #52
gte718h
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Hey guys. I will be upgrading from non-PP mk7 GTI to PP brakes over the holidays. I will have non-pp mk7 GTI pads, rotors, calipers, caliper carriers, dust shields, and even brake lines available for sale. PM me if you are interested in buying. Otherwise I will list them after I do the brake upgrade but I am trying to give someone who has been thinking about this an opportunity to call dibs.

Last edited by gte718h; 11-22-2017 at 06:46 AM.
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Old 11-23-2017, 09:03 PM   #53
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Quote:
Originally Posted by gte718h View Post
Hey guys. I will be upgrading from non-PP mk7 GTI to PP brakes over the holidays. I will have non-pp mk7 GTI pads, rotors, calipers, caliper carriers, dust shields, and even brake lines available for sale. PM me if you are interested in buying. Otherwise I will list them after I do the brake upgrade but I am trying to give someone who has been thinking about this an opportunity to call dibs.


Good on you for letting a deal for someone. I hope someone takes you up on this. The carriers were the hardest to find for me
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Old 11-27-2017, 07:14 PM   #54
o_a_ravi
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Originally Posted by o_a_ravi View Post
Thanks for the advise GolfDave., seems like 288mm to 312mm seems to be the best value for the money.

Since you have already done this mod, do you see a good difference in terms of braking ?

Somehow I feel the stock brakes are not very sufficient even for daily driving, it dont do track or any spirited driving though...
Finally was able to get this upgrade done on my vehicle. Thanks for all your detailed information. Helped me a ton !

Love the handling, braking is much more refined and progressive now.

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Old 11-27-2017, 08:18 PM   #55
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Originally Posted by o_a_ravi View Post
Finally was able to get this upgrade done on my vehicle. Thanks for all your detailed information. Helped me a ton !

Love the handling, braking is much more refined and progressive now.

Sent from my SM-G955U using Tapatalk
Like I said the rest of the system is designed from the outset as a 312mm system, just they downsize the disc to 288mm for the lesser powered/cheaper version....& totally ruin the braking in the process...

Anyway glad you got it done all OK....
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Old 04-29-2018, 07:55 AM   #56
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I just wanted to give an update on this 312mm rotor upgrade.

It's been approximately ~1 year since Ive done this upgrade, but I have noticed that about ~2cm on the outer edge on the 312mm rotor is extra shiny.

I have investigated this in more detail tonight by taking everything apart and noticed my factory caliper part #5QM615123 (55mm diameter piston) is not evenly positioned over the brake pad. The caliper piston circumference sits right at the outer edge of the brake pad.

This means there is more pressure applied on the outer edge of the 312mm rotor than on the inner edge. Having removed and inspected the brake pads, I could clearly see the outer section of the pad being worn more than the inner section.

I wish I had noticed the position of the piston over the brake pad when I originally did the upgrade. Unfortunately now I have to waste more $$$ on new rotors, pads and (calipers part #8V0615123D which have 57mm diameter pistons) so it will be a balanced fit over the brake pads.

Last edited by autovelocity; 04-29-2018 at 08:12 AM.
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Old 04-29-2018, 09:26 AM   #57
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Originally Posted by autovelocity View Post
I just wanted to give an update on this 312mm rotor upgrade.

It's been approximately ~1 year since Ive done this upgrade, but I have noticed that about ~2cm on the outer edge on the 312mm rotor is extra shiny.

I have investigated this in more detail tonight by taking everything apart and noticed my factory caliper part #5QM615123 (55mm diameter piston) is not evenly positioned over the brake pad. The caliper piston circumference sits right at the outer edge of the brake pad.

This means there is more pressure applied on the outer edge of the 312mm rotor than on the inner edge. Having removed and inspected the brake pads, I could clearly see the outer section of the pad being worn more than the inner section.

I wish I had noticed the position of the piston over the brake pad when I originally did the upgrade. Unfortunately now I have to waste more $$$ on new rotors, pads and (calipers part #8V0615123D which have 57mm diameter pistons) so it will be a balanced fit over the brake pads.
This how to guide upgrade is from the 288mm to the 312mm...as the same calliper & pads are used for both systems.

The next size down is the 276mm disc but this uses a differ setup & the pads/callipers are not interchangeable with either the 288mm or the 312mm systems..

So I am at a lose as to what you have done....or how you say you have a 55mm piston?...the size is written on the side of the caliper..usually the part facing the rear face of disc..

The part number you give is for a 288mm disc/caliper...PR code 1ZPE/1ZP...same as mine..

EDIT...just found that in USA there are two callipers quoted for the 1ZE/1ZP codes & both for the 288mm discs..(again no piston size info on ETKA)..

8V0 615 123 (mine) up to june 2014

5QM 615 123 yours from July 2014
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Last edited by golfdave; 04-29-2018 at 09:32 AM.
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Old 04-29-2018, 10:15 AM   #58
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5QM 615 123 has a 55mm diameter piston. I have measured it while i had the caliper out.

And yes, the 5QM 615 123 fits on the 8V0 615 125A/126A carriers, however as I said, the piston is positioned a little offset on the brake pad.

The inner part of the pad has less piston surface coverage than the outer part of the pad.

I believe your 8V0 615 123 caliper is the correct fit for the 8V0 615 125A/126A carriers.

So to clarify, the reason why you have a flawless fit is because you are using the 8V0 615 123 calipers in combination with the 8V0 615 125A/126A carriers.
I need to dump the 5QM 615 123 caliper and get the 8V0 615 123 model.

To give a basic illustration of what I mean in case someone does not understand look look at this:

Last edited by autovelocity; 04-29-2018 at 11:20 AM.
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Old 04-29-2018, 03:38 PM   #59
pokeyjoe
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Quote:
Originally Posted by golfdave View Post
8V0 615 123 (mine) up to june 2014

5QM 615 123 yours from July 2014
Hmmm. I have a 2017 Golf. I would think I would have the latter caliper. I do not, however, have any unusual wear on my rotors. I have had them installed for about 9 months.
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Old 04-29-2018, 07:13 PM   #60
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Hmmm. I have a 2017 Golf. I would think I would have the latter caliper. I do not, however, have any unusual wear on my rotors. I have had them installed for about 9 months.
Yes, but if you have the factory 5QM 615 123 caliper, are you using it in combination with the 312mm rotor and the 8V0 615 125A/126A carriers?
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Old 04-29-2018, 08:00 PM   #61
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5QM 615 123 has a 55mm diameter piston. I have measured it while i had the caliper out.

And yes, the 5QM 615 123 fits on the 8V0 615 125A/126A carriers, however as I said, the piston is positioned a little offset on the brake pad.

The inner part of the pad has less piston surface coverage than the outer part of the pad.

I believe your 8V0 615 123 caliper is the correct fit for the 8V0 615 125A/126A carriers.

So to clarify, the reason why you have a flawless fit is because you are using the 8V0 615 123 calipers in combination with the 8V0 615 125A/126A carriers.
I need to dump the 5QM 615 123 caliper and get the 8V0 615 123 model.

I know that my calliper would be a flawless fit as its the same calliper used on the GTI/GTD besides the paint job...I contacted TRW UK ..TRW make the brakes...

Just what I did NOT know was that your Mexico built car would have a smaller piston version option for the 288mm disc....

I did speculate earlier in this thread that looking at the disc/piston ratios that VW should have made a piston 55mm in size to work better with the 288mm disc as the 57mm piston is to big for the 288mm disc as it is designed for the 312mm disc...

What I did not know then was that they do for the NAR market....

just goes to show my maths was right...
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Old 04-29-2018, 08:22 PM   #62
THEREALVRT
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great info on here. i am considering getting base model carriers and rotors for my gti to be able to fit 15 in wheels easily for drag racing.
now i know its a simple carrier/rotor swap!
btw i would be swapping between the 2 not downgrading permanently
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Old 04-29-2018, 08:50 PM   #63
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Yes, but if you have the factory 5QM 615 123 caliper, are you using it in combination with the 312mm rotor and the 8V0 615 125A/126A carriers?
I have the 5QM 615 126 B carrier.
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Old 04-29-2018, 09:04 PM   #64
golfdave
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I have the 5QM 615 126 B carrier.
That's the standard USA factory 288mm disc carrier...so you may have the 55mm pistons...so like "autovelocity"....

& NOT like me...as we get the 57mm piston 8V0 615 123 calliper for our 288mm discs..this caliper is that same piston size used on the 312mm GTI/GTD brakes....so a 288mm to 312mm disc swap only requires the carriers & discs...

Yours will require new callipers also to work 100%...
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Old 04-29-2018, 10:28 PM   #65
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That's the standard USA factory 288mm disc carrier...so you may have the 55mm pistons...so like "autovelocity"....

& NOT like me...as we get the 57mm piston 8V0 615 123 calliper for our 288mm discs..this caliper is that same piston size used on the 312mm GTI/GTD brakes....so a 288mm to 312mm disc swap only requires the carriers & discs...

Yours will require new callipers also to work 100%...

Correct! just sucks I have to rebuy new pads, rotors and calipers.
Btw, I wonder how the existing master cylinder which was made for the 55mm calipers will work with the new 57mm calipers.
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Old 04-29-2018, 10:49 PM   #66
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I'm not retrofitting anything but I've been researching Master cylinders recently. I've got a set of Brembo 17z coming for my TDI and I'm concerned (to put it mildly, haha). But from what I can tell every mk7 has a 23.8mm master cylinder.

Both 7zap and parts.vw spec part numbers beginning 8V1 611 021. However, the R part number ends 021B while the TDI ends 021A. Research of both shows the same diameter. Could the stroke be different?

For what it's worth the GTI specs the 021B part and doesn't differentiate PP/non-PP. Makes sense that I haven't read any complaints about pedal feel when upgrading a non PP GTI to PP/R brakes.

The brake booster changed part numbers in December 2015, went from an ATE to a TRW part but did so for Golf/GTI/Rs.

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Old 04-30-2018, 01:48 AM   #67
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I just looked at my master cylinder and it's a 5Q1 611 301C which surprisingly is used on a lot of GTI models.

https://parts.vw.com/p/Volkswagen_20...Q1611301C.html

This means the new 57mm calipers will be just fine with the existing master cylinder.
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Old 04-30-2018, 01:59 AM   #68
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I just looked at my master cylinder and it's a 5Q1 611 301C which surprisingly is used on a lot of GTI models.

https://parts.vw.com/p/Volkswagen_20...Q1611301C.html

This means the new 57mm calipers will be just fine with the existing master cylinder.
I believe you're looking at the master cylinder reservoir. The master cylinder itself sits underneath it.

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