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Bleeding Wilwood Calipers

 
Old 05-09-2019, 06:46 AM
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ykf7b0
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Default Bleeding Wilwood Calipers

I have a new set of Wilwood D8-4 calipers and drilled/slotted Wilwood rotors finally installed with minimum runout on my 76. I have researched and studied many articles on how to bleed these Wilwood's and there seems to be conflict regarding procedures that work. I would like to read what you did that worked for you on getting the Wilwood's bled and acquiring a nice firm brake pedal. Also, which brake fluid do you use?

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Old 05-09-2019, 11:15 AM
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Considering that you did not mention the master cylinder I'm presuming that it did not get changed, then you want to use the same type of brake fluid that was in the system as before. I have Wilwood rotors and the D8 aluminum calipers on my blue car. As far as bleeding I first used a 'Motive bleeder' bleeding the bottom first then the top, starting with the furthest away caliper and so on. Got a fair pedal took it out for a test ride and just beat on the brakes. Solicited some help and rebleed the brakes using a heavy foot on the pedal, now have excellent pedal height and it's rock hard with straight even braking. Also mine is a manual brake application. T
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Old 05-09-2019, 11:53 AM
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I feel the need to step in here already.

There is no such thing as "bleeding the bottom". The calipers are built with bleed screws top and bottom for a universal mount design. ALL bleeding on any caliper is from the TOP ONLY. In fact you can plug the bottom ports and save the removed bleeder for future use if you choose. Just about any opening of the "bottom bleeder" will result in the introduction of air in the system.

In the rear, because of the mount angle, you'll want to remove the caliper and bleed it in the most vertical manner possible. This will require a temporary "something" fit between the pads so they don't push out with the pistons as you apply pressure.

This is clearly stated on page 4 of the PDF
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Old 05-09-2019, 02:03 PM
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Originally Posted by Todd TCE View Post
I feel the need to step in here already.

There is no such thing as "bleeding the bottom". The calipers are built with bleed screws top and bottom for a universal mount design. ALL bleeding on any caliper is from the TOP ONLY. In fact you can plug the bottom ports and save the removed bleeder for future use if you choose. Just about any opening of the "bottom bleeder" will result in the introduction of air in the system.

In the rear, because of the mount angle, you'll want to remove the caliper and bleed it in the most vertical manner possible. This will require a temporary "something" fit between the pads so they don't push out with the pistons as you apply pressure.

This is clearly stated on page 4 of the PDF
But why doesn't Wilwood revise the rear caliper bleeder location to match the stock calipers so they can be bled mounted to the bracket? Seems like it would be a simple programming change when machining the calipers.
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Old 05-09-2019, 02:39 PM
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Originally Posted by Kid Vette View Post
But why doesn't Wilwood revise the rear caliper bleeder location to match the stock calipers so they can be bled mounted to the bracket? Seems like it would be a simple programming change when machining the calipers.
I would imagine as said above the calipers are meant for a universal design. They are not Corvette specific. why do they not make Corvette specific? probably due to the low volume of them that would be made and these work fine if bleed properly as said above. Just my .02. I have them on my Vette and my Cobra and they stop very well with a firm pedal.
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Old 05-09-2019, 04:37 PM
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Originally Posted by Kid Vette View Post
But why doesn't Wilwood revise the rear caliper bleeder location to match the stock calipers so they can be bled mounted to the bracket? Seems like it would be a simple programming change when machining the calipers.
Because they know it bugs you....lol!~
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Old 05-09-2019, 06:08 PM
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With my Wilwood calipers I got a much better pedal with DOT3 than DOT4. This doesn't make sense to me, there shouldn't be a difference, but this is what I've found.
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Old 05-09-2019, 09:15 PM
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Originally Posted by Gordonm View Post
I would imagine as said above the calipers are meant for a universal design. They are not Corvette specific. why do they not make Corvette specific? probably due to the low volume of them that would be made and these work fine if bleed properly as said above. Just my .02. I have them on my Vette and my Cobra and they stop very well with a firm pedal.
Actually, they are Corvette specific. D8-4 Calipers ". . .are a direct bolt-on replacement for the OE factory calipers on all 1965-82 Corvettes"
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Old 05-09-2019, 09:58 PM
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Originally Posted by Kid Vette View Post
Actually, they are Corvette specific. D8-4 Calipers ". . .are a direct bolt-on replacement for the OE factory calipers on all 1965-82 Corvettes"
To me, that sentence does not mean that they are Corvette-specific.
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Old 05-10-2019, 08:32 AM
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Originally Posted by RBrid View Post
To me, that sentence does not mean that they are Corvette-specific.
Bleeding Wilwood direct replacement rear brakes "Do you think someone just pulled numbers out of thin air to produce these parts? They were of course copied from oe parts or those supplied to them for that purpose. These entire kits came about by the request of a very large Corvette parts supplier who is also a vendor here.

Did they supply Wilwood incorrect parts? How would either of us know. But they were 'signed off' being correct by that vendor who had a somewhat exclusive on them for a bit of time."

The "very large Corvette parts supplier who is also a vendor here" is Van Steel. VS just missed the bleeder location problem when they signed off on the design.
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Old 05-10-2019, 01:21 PM
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Originally Posted by Kid Vette View Post
Bleeding Wilwood direct replacement rear brakes "Do you think someone just pulled numbers out of thin air to produce these parts? They were of course copied from oe parts or those supplied to them for that purpose.
Mechanical drawings of the Willwood calipers are available from their website. Piston diameters and mounting positions conform almost identically to the OEM parts.

Todd: Any possibility that some sort of adapter could be fab'd to have the bleeders point straight up somehow? My pedal has gotten a little soft after five years and bleeding the fronts didn't fix it. I am really looking forward to getting the car back in the air, dismounting the calipers, putting in some pieces of wood to replace the rotor, bleeding the brakes, and then retorquing things. Maybe while I'm in there I'll think about that.
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Old 05-10-2019, 02:25 PM
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Originally Posted by ignatz View Post
Mechanical drawings of the Willwood calipers are available from their website. Piston diameters and mounting positions conform almost identically to the OEM parts.

Todd: Any possibility that some sort of adapter could be fab'd to have the bleeders point straight up somehow? My pedal has gotten a little soft after five years and bleeding the fronts didn't fix it. I am really looking forward to getting the car back in the air, dismounting the calipers, putting in some pieces of wood to replace the rotor, bleeding the brakes, and then retorquing things. Maybe while I'm in there I'll think about that.

I don't see an easy way to make it work without a messy deal. You'd end up with four bleed screws per caliper.
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Old 05-10-2019, 02:41 PM
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Originally Posted by Todd TCE View Post
I don't see an easy way to make it work without a messy deal. You'd end up with four bleed screws per caliper.

I'm sorry I wasn't quite clear. The idea would be to have the mounting flange rotate it some to be more vertical. It's all GM's fault. The calipers should all be inboard anyway to minimize the moment of inertia.
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Old 05-10-2019, 09:44 PM
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Originally Posted by ignatz View Post
I'm sorry I wasn't quite clear. The idea would be to have the mounting flange rotate it some to be more vertical. It's all GM's fault. The calipers should all be inboard anyway to minimize the moment of inertia.
Not familiar enough with the platform to say if the anchors could be relocated or rotated on the trailing arm. Sorry.

*Looking at this I'm not sure where you'd put them.
https://www.wilwood.com/Images/Brake...651_IPB-lg.jpg

Even the BBKs have the same issue:http://www.tceperformanceproducts.co...ll%2010471.jpg

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Old 05-13-2019, 10:18 PM
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The rear calipers are a total mess to get bled. Removing them and positioning them completely vertical is an inconvenience but the brake fluid shooting straight up and running down the calipers and rotors is down right nasty. Smaller tubing would have helped a little without as much of a mess but I still don't like it.
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Old 05-14-2019, 09:18 PM
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I cannot seem to get good pedal height or a firm pedal with these Wilwoods and neither did I ever have a good pedal with the factory calipers. What am I missing with these Corvette brakes?
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Old 05-14-2019, 09:56 PM
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Originally Posted by ykf7b0 View Post
I cannot seem to get good pedal height or a firm pedal with these Wilwoods and neither did I ever have a good pedal with the factory calipers. What am I missing with these Corvette brakes?
What I have observed, and I can't say why, is, after getting the best pedal I can, I go out and drive them a bit hard, and they get better. That has often included new pads.

Last edited by ignatz; 05-14-2019 at 11:55 PM.
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Old 05-15-2019, 09:47 AM
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Originally Posted by ykf7b0 View Post
I cannot seem to get good pedal height or a firm pedal with these Wilwoods and neither did I ever have a good pedal with the factory calipers. What am I missing with these Corvette brakes?
Start here before you check for air in a caliper. Make sure all air is out of the MC.

https://www.corvetteforum.com/forums...-cylinder.html

Once you feel all is good at the MC then pressure bleed the calipers.

This is how I pressure bleed. Use about 20 PSI

The first time bleeding the rears I did bleed with the calipers removed and set vertical. Since then I bleed while on the car.


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Old 05-15-2019, 11:18 AM
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I have bench bled the master and have also removed the new rear Wilwood calipers, used woodern blocks to keep the pistons in, and positioned them vertically. I have a Motive power bleeder then used 15 psi and have bled each caliper 5 times already. As suggested, I bled using the top most 2 bleeders on each caliper and I submerged the bleeder tube in brake fluid to prevent the possibility of drawing in any air. As recommended by Wilwood, I started at the left rear outside bleeder then, right rear, front left, and finally right front.
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Old 05-15-2019, 11:36 AM
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Originally Posted by ykf7b0 View Post
I have bench bled the master
Yup but try bleeding the MC while on the car. This will bleed the trapped air in the MC.

View the link above, you need the jack up the back of the car to get this to work correctly. Bench bleeding doesn't always get all the air out.
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