Caliper sizes???

opelspyder · 07-07-2008

Okay, starting to wonder how many caliper piston sizes Opel used on US imported cars. I count 4 now

1 Manta 75 models and 1900s
2 GT
3 Kadett 1.9 and GT 1.1
4 Kadett 66-67

Are there any others? The 66-67 measured slightly smaller than the later 1.1 and Kadett 1.9 pistons, from NOS parts I've had, but now really wondering.
Keith

oldopelguy · 07-07-2008

From my experience:

The Kadett 1.1L caliper is the same as the GT 1.1l caliper and is smaller in diameter than the 1.9L calipers.

The Kadett 1.9L caliper is the same diameter as the GT 1.9L caliper which is the same diameter as the 1900/Ascona/Mantas.

The early Kadett B used a smaller diameter caliper that doesn't directly interchange with the rest.

opelspyder · 07-07-2008

I assumed the Kadett 1.9 Calipers were the same as a GT with 1.9 as well. But guess what, they are NOT!!!!!

Found out the hard way this weekend when I started disassembly of them. Turns out they are the same part number as a 1.1 GT, as my new seal kits were way too big. I will put the GT ones on it due to the seals I ordered. But you might want to check again as well. I am learning quickly that the Kadett and the GT share less and less in common.
Keith

Killer Texas GT · 12-14-2008

The "Piston" diameter for the 1.9 Kadett, GT, Manta and Ascona (including the 75"big brake) is 48mm. The "Piston" diameter for the 1.1 Kadett and GT is 44 mm.
The 1.1 calipers are also smaller in physical size and mounting bolt pattern compared to the 1.9s. The "75 big brake" is larger in physical size than the typical brake caliper from a 1.9, but has the same bolt pattern mounting.

Gordy · 12-14-2008

I went to the Tire Rack and just ordered the proper rotors for the 1975 brake set up so there should be no issues. They've got a good selection of Koni and KYB shocks as well. Ordered the calipers from Rock Auto at $45 each.

kwilford · 12-14-2008

Originally Posted by Gordy

I went to the Tire Rack and just ordered the proper rotors for the 1975 brake set up so there should be no issues. They've got a good selection of Koni and KYB shocks as well. Ordered the calipers from Rock Auto at $45 each.

The posts on upgrading to larger rotors were off-topic, so I split them off to
http://www.opelgt.com/forums/perform...tml#post180258

07-07-2008	#1 (permalink)
opelspyder Opel Key Master Join Date: Mar 2002 Location: Tennessee Posts: 1,301 Provided Answers: 4	Unanswered: Caliper sizes??? Okay, starting to wonder how many caliper piston sizes Opel used on US imported cars. I count 4 now 1 Manta 75 models and 1900s 2 GT 3 Kadett 1.9 and GT 1.1 4 Kadett 66-67 Are there any others? The 66-67 measured slightly smaller than the later 1.1 and Kadett 1.9 pistons, from NOS parts I've had, but now really wondering. Keith __________________ Questions or comments to the Project: Restoration of a GT series 2 -post here http://www.opelgt.com/forums/opel-gt...eries-2-a.html

07-07-2008	#2 (permalink)
oldopelguy Have Opel, Will Travel Join Date: Mar 2002 Location: Saint Michael, MN Posts: 1,727 Logbook Entries: 3 Provided Answers: 2	From my experience: The Kadett 1.1L caliper is the same as the GT 1.1l caliper and is smaller in diameter than the 1.9L calipers. The Kadett 1.9L caliper is the same diameter as the GT 1.9L caliper which is the same diameter as the 1900/Ascona/Mantas. The early Kadett B used a smaller diameter caliper that doesn't directly interchange with the rest. __________________ 1958 Rekord Sedan, 1958 Olympia Wagon, 1959 Opel Olympia Sedan, 1967 Kadett Coupe, 1967 Admiral Sedan 4L CIH-6, 1968 Kadett fastback 1.1L, 1970 Kadett Wagon Turbo 2.2L, 1971 Kadett Sedan 1.1L, 1975 Manta Wagon 4.3L V-6

07-07-2008	#3 (permalink)
opelspyder Opel Key Master Join Date: Mar 2002 Location: Tennessee Posts: 1,301 Provided Answers: 4	Kadett Calipers I assumed the Kadett 1.9 Calipers were the same as a GT with 1.9 as well. But guess what, they are NOT!!!!! Found out the hard way this weekend when I started disassembly of them. Turns out they are the same part number as a 1.1 GT, as my new seal kits were way too big. I will put the GT ones on it due to the seals I ordered. But you might want to check again as well. I am learning quickly that the Kadett and the GT share less and less in common. Keith __________________ Questions or comments to the Project: Restoration of a GT series 2 -post here http://www.opelgt.com/forums/opel-gt...eries-2-a.html

12-14-2008	#4 (permalink)
Killer Texas GT Senior Contributor Join Date: Jan 2003 Location: Leonard, Texas Posts: 888 Provided Answers: 1	The "Piston" diameter for the 1.9 Kadett, GT, Manta and Ascona (including the 75"big brake) is 48mm. The "Piston" diameter for the 1.1 Kadett and GT is 44 mm. The 1.1 calipers are also smaller in physical size and mounting bolt pattern compared to the 1.9s. The "75 big brake" is larger in physical size than the typical brake caliper from a 1.9, but has the same bolt pattern mounting. __________________ rk 68 Kadett 2 Dr 1.1 SR/Rallye Suspension 68 Kadett Rallye 1.9/4 Spd & AC 69 GT 1.9/4 Spd 70 GT 1.9/5 Spd,87 Impulse PB/MC/4 wheel 10.5" vented Disc/complete suspension/power assist & tilt wheel steering 71 Kadett 2 Dr 1.1/4 Spd/4 wheel drum brakes(project:to a 1.9 FI/Auto 75 Big Brakes/Impulse vented rr Disc, Factory AC from Buick/Opel by Isuzu 72 GT 1.9 FI/Auto 75 Big Brakes/Impulse vented rr Disc 73 Manta Rallye 75 Ascona 1.9 FI/5 Spd/Impulse rr Disc brakes OPEL WERKS Last edited by kwilford; 12-14-2008 at 12:13 PM.

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12-14-2008	#5 (permalink)
Gordy Member Join Date: Mar 2002 Location: Loves Park, IL (Rockford area) Posts: 805	I went to the Tire Rack and just ordered the proper rotors for the 1975 brake set up so there should be no issues. They've got a good selection of Koni and KYB shocks as well. Ordered the calipers from Rock Auto at $45 each.

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