MG ZT190 "BMW" Calipers compared to those on lower spec ZTs.

Abott10 · 20th July 2016, 22:48

In the process of renewing the Front Brake Discs and Pads on two MG ZT-Ts, I had the opportunity to compare the Pads' shapes and dimensions of the ZT190 with those on the "lesser" ZTs. The pads for both Calipers are identical!

I was under the impression the ZT190's Front Brakes were of superior capacity with larger overall diameter. From memory I believe the 190's Discs are 325mm against those on the other ZTs of 280.

So, is it simply the larger diameter of the 190's Brake Discs are the only differences as the Calipers look much the same. Anyone able to clarify? TIA.

clf · 20th July 2016, 23:04

having a very quick search on eBay, the sizes listed with this seller for the two different types are different for each type. Which is what I would expect really.

DIESEL fit

190 fit

SCP440 · 21st July 2016, 07:04

For the same force between the disc and pads, a bigger rotor generates more torque on the wheel - i.e. more stopping force. It is running though the pads faster, generating more friction for the same pressure, more stopping power, and as it has bigger surface area, is dissipating more of the generated heat, meaning the disc and pads run colder. So, for the same caliper and brake pad, a bigger rotor generates more braking for the same pressure or the same amount of braking for less pressure.

TomRS · 21st July 2016, 09:13

It wouldnt suprise me if they are the same.

I have a set of 190 callipers at home i shall take pictures of those and upload them for comparison.

They could be the same callipers with a larger spaced out carrier so as above larger rolling radius of the brake disc means more brake force even if both pads are the same size.

BigBen · 21st July 2016, 09:55

Hmmm.....

According to the Delphi, Mintex and EBC websites the size of the front pads/discs on the 'lesser' models is 157x68x18mm (pads) with 284x22mm (discs) and the sizes for the 190 (and 260) models is 155x64x20mm (pads) with 325x25mm (discs).

So it would seem that there is a definite difference - although not by a lot!

These measurements for the pads are very close - you may even be able to get the wrong pads to fit and work OK....

BUT it could have severe repercussions with insurance etc. if the worst were to happen and you had the wrong disc/caliper/pad combination....

Ben.

Plezier · 21st July 2016, 22:49

John the 623 Auto also has the same brakes as the 620Ti.

TomRS · 22nd July 2016, 09:02

I will be home and changing the pads/discs this afternoon so i'll snap some pics and upload.

klarzy · 23rd July 2016, 07:48

I love my new setup too, the larger area of disk does indeed give a longer lever, plus I think the piston diameter in the 190 caliper us larger so gives a higher brake force....

TomRS · 27th July 2016, 10:28

Sorry i didnt take any pics, i was in a rush and completely forgot about this so apologies John!

20th July 2016, 22:48	#1
Abott10 * Join Date: Apr 2014 Posts: 227 Thanks: 1,275 Thanked 1,917 Times in 1,328 Posts	MG ZT190 "BMW" Calipers compared to those on lower spec ZTs. In the process of renewing the Front Brake Discs and Pads on two MG ZT-Ts, I had the opportunity to compare the Pads' shapes and dimensions of the ZT190 with those on the "lesser" ZTs. The pads for both Calipers are identical! I was under the impression the ZT190's Front Brakes were of superior capacity with larger overall diameter. From memory I believe the 190's Discs are 325mm against those on the other ZTs of 280. So, is it simply the larger diameter of the 190's Brake Discs are the only differences as the Calipers look much the same. Anyone able to clarify? TIA.

20th July 2016, 23:04	#2
clf This is my second home MG ZT CDTi Join Date: Jan 2014 Location: carrick Posts: 7,859 Thanks: 3,494 Thanked 2,657 Times in 1,973 Posts	having a very quick search on eBay, the sizes listed with this seller for the two different types are different for each type. Which is what I would expect really. DIESEL fit 190 fit __________________ It is not gloss primer .............. it is duct tape silver!

21st July 2016, 09:13	#4
TomRS Posted a thing or two Mk1 ZT 190 - Mk2 ZS 180 - Mercedes E63 AMG S - Ford Ranger Hawk Join Date: Mar 2016 Location: Middlesbrough Posts: 1,456 Thanks: 123 Thanked 409 Times in 281 Posts	It wouldnt suprise me if they are the same. I have a set of 190 callipers at home i shall take pictures of those and upload them for comparison. They could be the same callipers with a larger spaced out carrier so as above larger rolling radius of the brake disc means more brake force even if both pads are the same size. __________________ http://i66.tinypic.com/5cd6xj.jpg

21st July 2016, 09:55	#5
BigBen Loves to post R75 V8 Tourer, CDTi Auto Tourer (both Connie SE), MG ZT-T 190+, MG TF 115 Join Date: Feb 2013 Location: Here be Dragons! Posts: 490 Thanks: 106 Thanked 160 Times in 101 Posts	Hmmm..... According to the Delphi, Mintex and EBC websites the size of the front pads/discs on the 'lesser' models is 157x68x18mm (pads) with 284x22mm (discs) and the sizes for the 190 (and 260) models is 155x64x20mm (pads) with 325x25mm (discs). So it would seem that there is a definite difference - although not by a lot! These measurements for the pads are very close - you may even be able to get the wrong pads to fit and work OK.... BUT it could have severe repercussions with insurance etc. if the worst were to happen and you had the wrong disc/caliper/pad combination.... Ben. __________________ S. Wales meets cancelled until further notice [SIGPIC]https://www.the75andztclub.co.uk/forum/image.php?u=23989&type=sigpic&dateline=1467731033[/SIGPIC] Past cars:- BL: Discovery 3.1 & V8 2WD pick-up, Rover 800 Vitesse Turbo Coupe, 820 SLi 180 Fastback, 600ti, Montego 2.0EFi VDP, Ital 1.3 Estate Ford: Transit Cosworth V6, Granada 2.9 V6 Scorpio & 2.8 V6 GL Volvo: 480 Turbo & 1.7 ES, 240 GLE Porsche: 944 2.7 Lux Audi: 100 ESE 20v Peugeot: 405 1.9 GR Talbot: Alpine 1.6 Rapier S Last edited by BigBen; 21st July 2016 at 09:57..

21st July 2016, 22:49	#6
Plezier I really should get out more....... Mercedes C Class CDI estate (2003) Join Date: Sep 2012 Location: Gradina Posts: 2,652 Thanks: 62 Thanked 137 Times in 119 Posts	John the 623 Auto also has the same brakes as the 620Ti. __________________ Classic SE CDT sadly lost in a severe collision.

21st July 2016, 07:04	#3
SCP440 I really should get out more....... MG ZT-T 260 Join Date: Feb 2016 Location: Witney Posts: 2,504 Thanks: 6 Thanked 910 Times in 571 Posts	For the same force between the disc and pads, a bigger rotor generates more torque on the wheel - i.e. more stopping force. It is running though the pads faster, generating more friction for the same pressure, more stopping power, and as it has bigger surface area, is dissipating more of the generated heat, meaning the disc and pads run colder. So, for the same caliper and brake pad, a bigger rotor generates more braking for the same pressure or the same amount of braking for less pressure.

22nd July 2016, 09:02	#7
TomRS Posted a thing or two Mk1 ZT 190 - Mk2 ZS 180 - Mercedes E63 AMG S - Ford Ranger Hawk Join Date: Mar 2016 Location: Middlesbrough Posts: 1,456 Thanks: 123 Thanked 409 Times in 281 Posts	I will be home and changing the pads/discs this afternoon so i'll snap some pics and upload. __________________ http://i66.tinypic.com/5cd6xj.jpg

23rd July 2016, 07:48	#8
klarzy This is my second home none but not gone Join Date: Mar 2013 Location: March, Cambs Posts: 16,437 Thanks: 894 Thanked 4,247 Times in 3,025 Posts	I love my new setup too, the larger area of disk does indeed give a longer lever, plus I think the piston diameter in the 190 caliper us larger so gives a higher brake force.... __________________ [SIGPIC][/SIGPIC]….All praise Bananaswan….

27th July 2016, 10:28	#9
TomRS Posted a thing or two Mk1 ZT 190 - Mk2 ZS 180 - Mercedes E63 AMG S - Ford Ranger Hawk Join Date: Mar 2016 Location: Middlesbrough Posts: 1,456 Thanks: 123 Thanked 409 Times in 281 Posts	Sorry i didnt take any pics, i was in a rush and completely forgot about this so apologies John! __________________ http://i66.tinypic.com/5cd6xj.jpg