Brembo Upgrade

['73OpelGT]

Ok guys I have the opel engine running, clutch works, and brakes work. However, I was thinking about updating and replacing the whole braking system to Brembo brakes. What do you guys think?

[Willy_g77]

i was going to get those vented rotors for my opel.. cools the brakes better.. although i dont have them on my opel i do have them on my nissan sentra and they work great.. but i was told you can't have them "turned" when they are done they are done..

[kwilford]

Originally Posted by '73OpelGT Ok guys I have the opel engine running, clutch works, and brakes work. However, I was thinking about updating and replacing the whole braking system to Brembo brakes. What do you guys think?

Which Brembo brakes do you mean? Brembo actually makes rotors that are identical to the factory rotors (Brembo part # 08.1309.10),and are quite nice. I have a set myself. But they are really no different than the stock rotors.

Now if you mean some kind of HIGH PERFORMANCE Brembo product, such as multi-piston calipers or a larger bore master cylinder and such, then the sky is the limit. Or maybe the bank loan that is needed. But I don't believe that Brembo makes any such products specifically for these vintages of Opels.

Now if you had RallyBob's fabrication skills, there are LOTS of choices. Have a search for "Wilwood", as I believe that Bob and others have adapted some of their products to Opels, at least for racing applications.

HTH

[madhatterpdc]

A nice upgrade that WORKS without getting crazy is to simply switch everything over to '75 brakes. Opel GT Source has the all the parts assembled as a kit, it's on the pricey side compared to assembling the parts yourself, but there is a lot of piece of mind. The next upgrade is braided stainless lines, spendy, but it makes an enormous difference in pedal feel. Finally, the single biggest upgrade that you can make to your brakes, is your TIRES!!! Your brakes are only as good as the amount of stickiness (or coefficient of friction in negative acceleration) your tires have.

Also poke around in the "Brakes" Section of this forum, many people wiser than me have discussed this problem at length. There is also some good information at http://www.tgsi.com/brakes.html (even though products can not be purchased from that site anymore).

[nobody]

Just an idea or way of doing some brake modifications.

http://www.opelgt.com/forums/showthr...=brake+upgrade

['73OpelGT]

So do all Brembo brake rotors fit on the opel?And if not which one's do?

[David McCollam]

Let's take a look at the facts. Brembo makes brake replacement parts and rotors. ATE was one of the original suppliers for brake components to Opel. Currently, if you want a high performance brake setup to go with that freshly tweeked engine. Picture this, widened ATE front brake calipers from a '75 Manta/Ascona and vented 246 x 22mm rotors, paired with 3/4" rear wheel cylinders.

There is a kit available from Risse Motorsport in Germany for 75 Euro to widen the stock '75 ATE caliper. There are also the BMW calipers that are available rebuilt from ATE-US. The vented rotors are also available and the calipers use BMW pads. Total cost for the calipers and rotors from the pre-8/77 vented rotor BMW 320i is about $200.

The rotors and expanded calipers would cost about the same. If you have the ATE calipers this might be a good choice. That's actually what I have on my Manta. The wheel cylinders are available as well for about $25 a piece. Throw on some Speedbleeders, SB7100 front and SB8125 rear, $28 plus shipping and you're set.

Could be all done for about $300 or so, plus your labor.

Good luck.

[kwilford]

Originally Posted by '73OpelGT So do all Brembo brake rotors fit on the Opel?And if not which one's do?

Well, the ones that fit, fit. What do you mean, "all"? I already mentioned the Brembo aftermarket rotor for the stock GT (Brembo part # 08.1309.10). Their web site also gives the number for the '75 rotor (Brembo part #08.2953.20) which along with the correct calipers (either the Opel Girling calipers, or the BMW ATE calipers, which a pair happens to be on eBay for a Buy It Now price of $39 each, and then you will need pads & a hardware kit), provides MUCH better brakes than the original set up. And the aforementioned 3/4" rear wheel cylinders also helps, but I believe you need a proportioning valve to use those (but maybe not with the bigger front brakes!).

HTH

[RallyBob]

Originally Posted by kwilford And the aforementioned 3/4" rear wheel cylinders also helps, but I believe you need a proportioning valve to use those (but maybe not with the bigger front brakes!).

Keith, the 3/4" rear cylinders make a very nice difference. Normally the Opel rear drums don't do a whole lot....I've seen cars out there with over 100k on them and they had the original rear shoes. So letting those shoes do more work is a good thing.

For a GT, the proportioning valve is a good idea. For a Manta or Ascona/Sportwagon, it's really not necessary.

IIRC, the proportioning valves I used to get from Germany (Parsget) to go with the 3/4" rear cylinders was from a Euro-spec Porsche 944 or something like that. I know it was a TUV-approved setup. I could look at the part number if that info is needed by someone, I should still have one or two of those proportioning valves kicking around in the barn.

Bob

[David McCollam]

Keith,

The use of the word "all" in my desciption above indicates my opinion that these parts could be installed inclusively for the named price or possibly within a reasonable variance of that amount. Is that what you are referencing?

Thanks,

[baz]

Originally Posted by David McCollam Keith, The use of the word "all" in my desciption above indicates my opinion that these parts could be installed inclusively for the named price or possibly within a reasonable variance of that amount. Is that what you are referencing? Thanks,

dave im guessing you work in management yes

[David McCollam]

Baz,

It's worse. I'm a CPA (chartered accountant) working as an internal auditor.

How's everything with you? That brake setup on the Rallye is there thanks to you.

[kwilford]

Originally Posted by David McCollam Keith, The use of the word "all" in my description above indicates my opinion that these parts could be installed inclusively for the named price or possibly within a reasonable variance of that amount. Is that what you are referencing? Thanks,

No Dave, I was referencing '73OpelGT's question, which I had quoted in the post. I have now bolded the "all" to make it clearer.

[David McCollam]

Message recevied and understood.

Thanks for the clarification.

[opeldean]

advance auto parts in kansas city has rebuilt ones for $45 each plus $10 core charge, no pads i think

i found a new right one for $125 at star motors,no left

[opeldean]

I sure this is a repeat question.

1-if i get manta 75 rotors from brembo,then get 77-83 bmw ate calipers, use my same opel master cylinder, and i will have a big brake, non- vented front discs set up

2-but i will also need a proportioning valve( llike in a circle track catalog) and rear 3/4 wheel cylinders from ogts

[Mach1Tom]

Originally Posted by opeldean I sure this is a repeat question. 1-if i get manta 75 rotors from brembo,then get 77-83 bmw ate calipers, use my same opel master cylinder, and i will have a big brake, non- vented front discs set up 2-but i will also need a proportioning valve( llike in a circle track catalog) and rear 3/4 wheel cylinders from ogts

1- ## That's pretty much correct. BUT, only early 77 ATE BMW 320 calipers are for the wider "vented rotors". ALL 78-83 calipers whether ATE or Girling brand will work. They are the same caliper in every way except for the manufacturer stamp on them. I have a couple sets of each type & they are Identical.

2- ## I haven't put the 75 front "big brakes" on my GT yet. I do have the 3/4" wheel cylinders installed for 4 years now & haven't had any problems. I guess once the front system is on, I'll see if the proportioning valve will be needed.

As for buying the 3/4" (19mm) wheel cylinders. autopartsgiant.com has them new for about $11 each. Automotive Specialty (TRW) part # W-13002. They have great prices on all Opel parts. I've been dealing with them for years.

~ Tom

[jordan]

I can not find the 3/4 wheel cylinder on autopartsgiant.com even from part numbers, can some one post the link to the exact part. Also are they a direct bolt up?

[opeldean]

i assume this is it

[Mach1Tom]

Dean - Yes, those are the 3/4 (19mm) Wheel Cylinders

Jordan - Yes, they are a direct bolt in. No modifications of any kind to install.

I tried, but couldn't post a direct link to that page.
From the center of the Home page is " START HERE".
Scroll to 'Opel' & 1975, then "SEARCH".
'click' BRAKE SYSTEM , then "Look it Up"
'Select Model' 1900 or Manta (same parts), then "Look it Up"
'click' Wheel Cyl & Parts, then "Look it Up"


~ Tom