Brake bleed valve seat....calling all brake gurus |
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Brake bleed valve seat....calling all brake gurus |
raynekat |
Nov 10 2018, 06:16 PM
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#1
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Advanced Member Group: Members Posts: 2,158 Joined: 30-December 14 From: Coeur d'Alene, Idaho Member No.: 18,263 Region Association: Pacific Northwest |
Just trying to get an answer over the weekend to a question I have.
I've got some new rear calipers going on the car and one of them is weeping some brake fluid. Hard to see exactly where it is coming from. Could be a bleeder valve or possibly a defect in the caliper casting. I have a question about the brake bleed nipple seat.....actually the very bottom where the end of the bleed valve bottoms out. See pic below: To me, the correct bottom of the bleed valve seat should be beveled to match the beveled point at the end of the bleed valve....such as the example on the right. My particular caliper has a seat bottom that is square like the example on the left. Not only do you get less surface area for the bleed valve to seat against possibly causing a leak even when the bleed valve is closed or tightened up....but if you tighten the bleed valve even a moderate amount, the square bottom will put a nice "step" in the bevel of your bleed valve. I don't believe that is an optimal situation or even wanted. Any thoughts or knowledge on this? I'm thinking I have an incorrectly machined bleed valve seat. I was thinking about taking a proper sized drill bit and putting a bevel down there, but the angle is not the same on the drill bit. On Monday I'll check with Eric at PMB for his take on this. |
raynekat |
Nov 14 2018, 12:24 PM
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#2
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Advanced Member Group: Members Posts: 2,158 Joined: 30-December 14 From: Coeur d'Alene, Idaho Member No.: 18,263 Region Association: Pacific Northwest |
Real 914-6 calipers with the spacers so they will fit over vented discs.
As real as I'm gonna get with this. (IMG:style_emoticons/default/wink.gif) Aren't the GT calipers just the six calipers with a couple of spacers thrown in between? |
mepstein |
Nov 14 2018, 01:19 PM
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#3
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914-6 GT in waiting Group: Members Posts: 19,276 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Real 914-6 calipers with the spacers so they will fit over vented discs. As real as I'm gonna get with this. (IMG:style_emoticons/default/wink.gif) Aren't the GT calipers just the six calipers with a couple of spacers thrown in between? Yes. The spacers are easy to find but I think the bolts are a special size but I could be making that up. My GT calipers are Ferrari 308 calipers that Eric machined for a second bleeder. They are the same ATE casting and come with a spacer but oriented 180 degrees on the red cars. Got the first set for $250 before the Ferrari guys caught on. |
raynekat |
Nov 14 2018, 02:15 PM
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#4
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Advanced Member Group: Members Posts: 2,158 Joined: 30-December 14 From: Coeur d'Alene, Idaho Member No.: 18,263 Region Association: Pacific Northwest |
Real 914-6 calipers with the spacers so they will fit over vented discs. As real as I'm gonna get with this. (IMG:style_emoticons/default/wink.gif) Aren't the GT calipers just the six calipers with a couple of spacers thrown in between? Yes. The spacers are easy to find but I think the bolts are a special size but I could be making that up. My GT calipers are Ferrari 308 calipers that Eric machined for a second bleeder. They are the same ATE casting and come with a spacer but oriented 180 degrees on the red cars. Got the first set for $250 before the Ferrari guys caught on. Eric is using more "common" type bolts on these....not the impossible to find Ribe sized bolts. |
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