 Brake pressure regulators, Difference between /4 and /6? |
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| zoomCat |
 Feb 12 2022, 12:24 PM
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#1
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Member  Group: Members Posts: 199 Joined: 13-August 04 From: Cincinnati, OH Member No.: 2,526 Region Association: None 
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There are different part numbers for the pressure regulators on the 4 and 6. Anybody know what the difference is?
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| Superhawk996 |
Feb 12 2022, 01:44 PM
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#2
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914 Guru Group: Members Posts: 7,025 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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The difference is in the set point at which the "regulator" begins to proportion rear brake pressure.
914/6 has a lower pressure knee point due to larger rear caliper pistons 38mm vs. smaller 33mm pistons for /4.  I belive PMB can reset a /4 regulator to the /6 set point if need be. There are also two types (early & late) for /4's where the inlet and outlet ports changed location to accomodate different mounting locations between early and late. If you were going to try to obtain and use a /4 regulator for a /6, you would want the early version. |
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| mlindner |
Feb 12 2022, 03:30 PM
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#3
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Senior Member Group: Members Posts: 1,667 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest
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Wow Superhawk996 that is great info again. This is just the best Porsche forum ever. Mark
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| partwerks |
Feb 12 2022, 07:57 PM
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#4
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Senior Member Group: Members Posts: 1,611 Joined: 7-September 06 From: Grand Island, NE Member No.: 6,787 |
Is this that part that is mounted in the engine bay, about 1/2 way up towards the driver's side with the brake lines hooked to it?
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| mepstein |
Feb 12 2022, 08:16 PM
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#5
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914-6 GT in waiting Group: Members Posts: 19,874 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(partwerks @ Feb 12 2022, 08:57 PM)  Is this that part that is mounted in the engine bay, about 1/2 way up towards the driver's side with the brake lines hooked to it? Yes |
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| zoomCat |
Feb 13 2022, 08:54 AM
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#6
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Member Group: Members Posts: 199 Joined: 13-August 04 From: Cincinnati, OH Member No.: 2,526 Region Association: None
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The previous owner had changed out the pressure regulator for an adjustable proportioning valve, I'm going back to stock. Are there any visible differences between the two, or do I have to hunt down a /6 part to have Eric rebuild?
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| mepstein |
Feb 13 2022, 09:12 AM
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#7
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914-6 GT in waiting Group: Members Posts: 19,874 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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QUOTE(zoomCat @ Feb 13 2022, 09:54 AM) The previous owner had changed out the pressure regulator for an adjustable proportioning valve, I'm going back to stock. Are there any visible differences between the two, or do I have to hunt down a /6 part to have Eric rebuild? I don’t think there is a visible difference. I think it’s more of a setting on the part to achieve a different pressure release. I would think it’s a needle in a haystack to find the original six part. I would ask Eric directly but I bet he can achieve the exact same performance from an early 914-4 piece. Eric did write up a thread that dives into this part in detail. |
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