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Will these Wilwood work?

 
Old 04-09-2018, 10:22 PM
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ariba
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Default Will these Wilwood work?

Hello
I have C3 1977
I found used SL4R 4-Piston Calipers part number 120-6543. Will they work in the front?
Do they need any brackets or any modification?

Thanks
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Old 04-09-2018, 10:40 PM
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gbvette62
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They're not a direct bolt on caliper, for the Corvette. You'll need an adapter or special bracket, to mount them. Also, I'm pretty sure they're designed for use with a 13 or 14 inch rotor, not the stock Corvette's 11.25" rotor. The D8-4 and D8-6 are Wilwood's direct bolt on 65-82 Corvette caliper.

I would contact Wilwood, to see what is needed to mount them.
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Old 04-09-2018, 10:45 PM
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Originally Posted by gbvette62 View Post
They're not a direct bolt on caliper, for the Corvette. You'll need an adapter or special bracket, to mount them. Also, I'm pretty sure they're designed for use with a 13 or 14 inch rotor, not the stock Corvette's 11.25" rotor. The D8-4 and D8-6 are Wilwood's direct bolt on 65-82 Corvette caliper.

I would contact Wilwood, to see what is needed to mount them.
Thanks
What if I went with my plan B and bought the direct fit D8-6. Will they accept 13 inch rotors? without modification or adapters.
Just to make sure I just bought 18 inch wheels.
Thanks

Last edited by ariba; 04-09-2018 at 10:46 PM.
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Old 04-10-2018, 12:03 AM
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Originally Posted by ariba View Post
Thanks
What if I went with my plan B and bought the direct fit D8-6. Will they accept 13 inch rotors? without modification or adapters.
Just to make sure I just bought 18 inch wheels.
Thanks
Direct fit calipers work with stock rotors.
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Old 04-10-2018, 12:19 AM
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Originally Posted by Big2Bird View Post
Direct fit calipers work with stock rotors.
Thanks
Yes I know but what if I am planning to change them to the 13 inch rotors will they be a direct fit to?
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Old 04-10-2018, 08:52 AM
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Originally Posted by ariba View Post
Thanks
Yes I know but what if I am planning to change them to the 13 inch rotors will they be a direct fit to?
No.
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Old 04-10-2018, 12:28 PM
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Originally Posted by ariba View Post
Thanks
Yes I know but what if I am planning to change them to the 13 inch rotors will they be a direct fit to?
As Big2bird said, the D8-6's (and the D8-4's) only work with stock rotors.

Wilwood offers front brake kits that come with either 13" or 14" rotors, and their Superlite 6R calipers. The larger rotors require 17" or larger wheels. They also have a kit with 12" rotors and their Dynapro calipers, that fit 15" wheels.
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Old 04-10-2018, 01:22 PM
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What is your plan for the car?
Do you really need to go to a 13-14 inch rotor?
I'll be using my 73 for street, open highway, spirited foothill, mountain and coastal roadways.
Wilwood tech's advised that with street and spirited use that I stay with D8-4 rear and D8-6 front calipers and their 11.75 rotors.
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Old 04-10-2018, 06:00 PM
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Originally Posted by OldCarBum View Post
What is your plan for the car?
Do you really need to go to a 13-14 inch rotor?
I'll be using my 73 for street, open highway, spirited foothill, mountain and coastal roadways.
Wilwood tech's advised that with street and spirited use that I stay with D8-4 rear and D8-6 front calipers and their 11.75 rotors.
It will not track the car. But I do want to change the rotors to 13 inch I just bought 18 inch wheels, the vette is a restomod.
If the I did not buy the used SL4R 4-Piston Calipers part number 120-6543. I will buy a new 6 pistons in the front.
or if I got the used SL4R in a good deal all put them in the rear.

Last edited by ariba; 04-10-2018 at 06:06 PM.
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Old 04-10-2018, 10:07 PM
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Update:
I just throw a low offer on the SL4R 4-Piston Calipers part number 120-6543 and the seller excepted it.
the Question what is the best brackets for the front or the back. I will use a 13 inch rotor.
Thanks
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Old 04-11-2018, 12:02 AM
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Originally Posted by ariba View Post
Update:
I just throw a low offer on the SL4R 4-Piston Calipers part number 120-6543 and the seller excepted it.
the Question what is the best brackets for the front or the back. I will use a 13 inch rotor.
Thanks
Here's the part number for the adapter (flat brackets) for the 13/14"
249-10622/23

-then you need the radial mount brackets...


You'll might have to make your own brackets... as the 6 piston kit they make will probably not work as the calipers use different radial mount brackets.

I'd call Wilwood- also ask then if you should go with a smaller bore Master cylinder.











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Old 04-11-2018, 12:19 AM
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Originally Posted by Richard454 View Post
Here's the part number for the adapter (flat brackets) for the 13/14"
249-10622/23

-then you need the radial mount brackets...


You'll might have to make your own brackets... as the 6 piston kit they make will probably not work as the calipers use different radial mount brackets.

I'd call Wilwood- also ask then if you should go with a smaller bore Master cylinder.











Thank You Richard454 for helping

I am planning to ask you in the future for the electric headlight conversion. Someone told me you have a good experience in them.
thanks
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Old 04-11-2018, 09:39 AM
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The four pots for the rear only and the use of the six pot fronts will necessitate the use of a smaller bore mc. A 1.00" should do the job for you. The smaller bore will bump up the line pressure to make up for the loss of clamp force using this caliper combo. Sticking with the current 1.125 will require an excessive amount of leg effort to slow the car.
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Old 04-11-2018, 03:11 PM
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Like Todd was saying, these calipers were intended for the REAR. They have 2.22" piston area, while the front caliper in the 13" brake kits has an area of 4.04".

Not only will you need a smaller bore master cylinder, you'll also need an adjustable proportioning valve to bring things back in sync between the front and rear, so that you're not locking up the rear brakes.
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Old 04-13-2018, 02:16 AM
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Originally Posted by CA_WxMan View Post
Like Todd was saying, these calipers were intended for the REAR. They have 2.22" piston area, while the front caliper in the 13" brake kits has an area of 4.04".

Not only will you need a smaller bore master cylinder, you'll also need an adjustable proportioning valve to bring things back in sync between the front and rear, so that you're not locking up the rear brakes.
Thank You CA-Wxman & Todd TCE

I am planning to use them in the rear do you think they will be functional?

for the front I will buy a 6 piston.
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Old 04-13-2018, 09:55 AM
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They'll be functional in the rear and pair well with the 4" fronts. Being that they don't bolt up to anything you have now...you have a lot of work ahead of you.

You do realize there are complete kits for this already made? And a no more than a Saturday project to install them.
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Old 04-16-2018, 12:57 AM
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Originally Posted by Todd TCE View Post
They'll be functional in the rear and pair well with the 4" fronts. Being that they don't bolt up to anything you have now...you have a lot of work ahead of you.

You do realize there are complete kits for this already made? And a no more than a Saturday project to install them.
Thanks you are right but the complete kit is for $1420 Wilwood 140-10616-R. I got the two used calipers for $150 they were very clean. I will use them for the rear. If I couldn't find a grate condition 6 pistons for the front for a good price the new kit is the way to go.
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