10-28-2023, 05:47 AM | #45 | |
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You're right, I just looked up the AP Racing CP 5200 calipers I used to have and they do indeed have 2 bleeders. It was 14 years ago, so foggy memory and all that. |
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Ennoch2264.00 |
10-28-2023, 06:55 AM | #46 | |
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Even if you made a caliper with both upper and lower crossover pipes (and I think they do exist), you still wouldn't be able to bleed the outer half of the caliper properly. As with most things, the fluid is going to take the path of least resistance, so if you had a single bleed nipple on the inner half, the fluid is going to flow from the fluid inlet directly up to the nipple. You will get virtually no fluid flow through the lower crossover, back around through the upper crossover and finally out of the nipple. If the single bleed nipple was on the outer half of the caliper, it's a similar situation. Fluid will flow from the fluid inlet through the upper crossover pipe and out of the nipple. It won't flow the other way. I guess if the upper crossover was significantly smaller that the lower one, the fluid would tend to go the other way, but you still have all the fluid that's above the fluid inlet that won't get flushed out. Either way, you need two nipples and they both need bleeding. I had to have a similar conversation with the BMW 'technician' that tried to bullshit me when they only blead the inner nipples on my blue calipers. It probably works on most of their customers too, but they picked the wrong victim that day. |
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MY340i731.50 |
10-28-2023, 07:26 AM | #47 |
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Thanks for that /\
Well my outboard bleed nipples look like they've never been touched. I guess I'll be doing it myself from now on! Just need to find the correct paint colour for the calipers now, since the dealer destroyed the paint on one of them during the fluid change. It's definitely not Estoril Blue as the internet claims. It's a fair bit darker than that. |
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10-28-2023, 05:16 PM | #48 | |||
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Yep, the mechanics of trying to fit a big brake caliper under a wheel necessitates two bleed nipples. The single nipple is common on motorbike and bike stuff but they also aren't quite so tight for space against the rim: Quote:
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I do have a spare OSF caliper sat there which could be sent to Paints4U for a blend scan to be made if you wanted the best possible match. I've got a good relationship with them for things like that and they've been happy to scan things for me for free before whereas it's normally a chargeable service. I guess it's a question of how important the perfect match is given the area is on the rear. Careful masking should make it possible to sort it without having to touch the front face. |
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