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Old 02-13-2019, 05:08 PM   #1
itlksez
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Default Master Cylinder Question

I have the power brake booster and master cylinder from an '86(?) 740 sitting here. All the lines were cut, so I don't know where they go. There are 3 ports coming out of this thing. Why 3?

Short and sweet answer is fine. Thanks!
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Old 02-14-2019, 05:42 AM   #2
alschnertz
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Old 02-14-2019, 10:50 AM   #3
itlksez
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Hold up... I haven't learned to count. There are actually 4!! I only have experience with cars that have 2 circuits. I tried to search this subject and came up relatively empty. I know Volvos use a triangulated circuitry setup, but I'd love any input on where all four of these go.

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Old 02-14-2019, 02:38 PM   #4
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Nevermind. I dug through pages of schematics and figured it out. Volvo safety redundancy!
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Old 02-14-2019, 03:06 PM   #5
hiperfauto
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You didn't specify ABS or not. ABS masters have 3 ports but one is blocked off (the plug is #26).



Non ABS masters have 4 ports. 2 lines go to the right front wheel and the other 2 go to the splitter.

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