Conversion of rear drum brks to disc.?

civin · 07-20-2002

Has anyone (here) converted their rear drum breaks to rear disc?
How complicated and how rewarding would this conversion be? Are there shops out there that will do this conversion. Or can I tackle this myself (rem..newbie)?

P.s. Anyone have a solid unrusted (metal belly pan)?
I don't want fiberglass....OGTS, has.

RallyBob · 07-20-2002

It's not a worthwhile conversion unless you are driving VERY fast and have enough power to get there....
The standard rear drums are very large for a car this size, but the front brakes could use some help. Standard rear drums with larger wheel cylinders and metallic pads will stop the car repeatedly from 130 mph with no problems. The stock front brakes, however, cannot.

Bob

opelgt722002 · 07-20-2002

Write to : marc.van.helleputte@belgacom.net

Last I heard he thougt he might be making metal belly pans by September of this year. He is already making the rear tail panel and deck lid.

No info on pricing or shipping.

Good luck on finding a metal belly pan.

Bob

civin · 07-22-2002

Rallybob
What would help the front disc. brakes, better pads, discs,? One of the brake packages from OGTS.?

RallyBob · 07-22-2002

The factors involved are the friction coefficient of the pads, the heat capability of the pads, the diameter of the rotors (which affects the brake torque), the piston diameters of the calipers (which affects the clamping force), and the thickness of the rotors (which affects the capability to absorb heat). At the minimum, I'd go for the 1975 rotors (they are 9 5/8" diameter as opposed to 9 3/8" for all earlier years, and they are .500" thick instead of .440" thick as the earlier ones are), go for a metallic or carbon-based pad, and try to get better air flow to the rotors and calipers to reduce temps (see the thread in the archives on this...with photos). If your budget allows it, then ventilated rotors are a nice upgrade, and while they themselves won't reduce braking distances, they will retard brake fade from repetitive braking from higher speeds.

Bob

davegt27 · 07-22-2002

Civin

its a mostly for looks mod

and a dam nice mod if you do it

contact GoinManta for details

HTH

Davegt74

GoinManta · 07-23-2002

http://www.opelmanta.com in the library.

The directions are there. I have converted my Manta and I loved the rear discs.. The brakes become very responsive.. and don't require adjustment like the drums.

Its is overkill? Probably.. but they look cool and improve braking emmensly.

But if you just want better brakes, 75' Opel Manta/1900 brakes help a lot for the front of a GT.

Charles

07-20-2002	#1 (permalink)
civin Opeler Join Date: Jun 2002 Location: ST, PAUL, MN Posts: 67 Classified Rating: 0% (0)	Unanswered: Conversion of rear drum brks to disc.? Has anyone (here) converted their rear drum breaks to rear disc? How complicated and how rewarding would this conversion be? Are there shops out there that will do this conversion. Or can I tackle this myself (rem..newbie)? P.s. Anyone have a solid unrusted (metal belly pan)? I don't want fiberglass....OGTS, has.

07-20-2002	#3 (permalink)
opelgt722002 GT Owner Join Date: Mar 2002 Location: Houston, Texas Posts: 228 Classified Rating: 100% (1)	belly pan Write to : marc.van.helleputte@belgacom.net Last I heard he thougt he might be making metal belly pans by September of this year. He is already making the rear tail panel and deck lid. No info on pricing or shipping. Good luck on finding a metal belly pan. Bob Last edited by opelgt722002; 07-20-2002 at 07:07 PM..

07-22-2002	#4 (permalink)
civin Opeler Join Date: Jun 2002 Location: ST, PAUL, MN Posts: 67 Classified Rating: 0% (0)	front disc. brakes Rallybob What would help the front disc. brakes, better pads, discs,? One of the brake packages from OGTS.?

07-23-2002	#7 (permalink)
GoinManta Opelitis since 1984 Join Date: Mar 2002 Location: Midlothian, VA Posts: 1,930 Classified Rating: 0% (0)	Isuzu Discs http://www.opelmanta.com in the library. The directions are there. I have converted my Manta and I loved the rear discs.. The brakes become very responsive.. and don't require adjustment like the drums. Its is overkill? Probably.. but they look cool and improve braking emmensly. But if you just want better brakes, 75' Opel Manta/1900 brakes help a lot for the front of a GT. Charles

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07-20-2002	#2 (permalink)
RallyBob Project 1450 supporter... Join Date: Mar 2002 Location: Pleasant Valley, CT Posts: 6,656 Classified Rating: 0% (0) Provided Answers: 4	It's not a worthwhile conversion unless you are driving VERY fast and have enough power to get there.... The standard rear drums are very large for a car this size, but the front brakes could use some help. Standard rear drums with larger wheel cylinders and metallic pads will stop the car repeatedly from 130 mph with no problems. The stock front brakes, however, cannot. Bob

07-22-2002	#5 (permalink)
RallyBob Project 1450 supporter... Join Date: Mar 2002 Location: Pleasant Valley, CT Posts: 6,656 Classified Rating: 0% (0) Provided Answers: 4	The factors involved are the friction coefficient of the pads, the heat capability of the pads, the diameter of the rotors (which affects the brake torque), the piston diameters of the calipers (which affects the clamping force), and the thickness of the rotors (which affects the capability to absorb heat). At the minimum, I'd go for the 1975 rotors (they are 9 5/8" diameter as opposed to 9 3/8" for all earlier years, and they are .500" thick instead of .440" thick as the earlier ones are), go for a metallic or carbon-based pad, and try to get better air flow to the rotors and calipers to reduce temps (see the thread in the archives on this...with photos). If your budget allows it, then ventilated rotors are a nice upgrade, and while they themselves won't reduce braking distances, they will retard brake fade from repetitive braking from higher speeds. Bob

07-22-2002	#6 (permalink)
davegt27 Certified Opelholic Join Date: May 2002 Location: Aurora, CO Posts: 862 Classified Rating: 100% (1)	Civin its a mostly for looks mod and a dam nice mod if you do it contact GoinManta for details HTH Davegt74

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