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Nissan Forum: Brake Booster.
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Old 05-28-2017, 05:11 PM
Van Fink Van Fink is offline
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Default Brake Booster.

I think my brake booster needs to be replaced. Still have good brakes, but when I apply the brakes the engine idles erratically. How hard is the unit to change out & what would I expect to pay for a rebuilt booster? It's a 91 D21 with 5 speed. Van
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Old 05-29-2017, 01:58 AM
jp2code jp2code is offline
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Location: Longview, TX [USA]
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You might try ebay or one of the Facebook groups like this one:

https://www.facebook.com/groups/D21Classifieds/
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~Joe (not a mechanic!)
1994 Heavy Duty D21, Long Bed, 2WD, V6, 5-speed
Free Hardbody Service Manuals: http://www.nicoclub.com/FSM/Hardbody/
Trouble Codes for Nissan 1988-1995: http://nissanforum.org/nissan-forum/showthread.php?t=23202
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Old 06-06-2017, 03:51 AM
Myers503 Myers503 is offline
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To test your booster pump the brakes with the engine off maybe 5 times to deplete the vacuum storage. Then push on your brake pedal when starting the engine and keep it on the brake pedal. It should travel a little further. If it does then your booster is fine and your issue lies else ware the booster is just amplifying it.
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