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Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
Brake issue

Pre-Power Stroke Diesel (7.3L IDI & 6.9L) Diesel Topics Only

Brake issue

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Old

May 8, 2017 | 12:33 AM

#1

Whitman026

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Joined: May 2017

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Brake issue

Well I have a 92 F250 with a 7.3 IDI, The brake pedal is hard most of the time while driving but some times when I down shift or if I am in 5th gear for a long period of time I will get 1 shot of normal brakes. Also the Rear ABS light just recently came on. I am leaning towards the vacuum pump but I would like to get other opinions. I have already changed the brake booster check valve. Also the A/C isn't working and the heat is defrost only which points towards a vacuum issue. Got any ideas?

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Old

May 8, 2017 | 07:07 AM

#2

tecgod13

Logistics Pro

Joined: Sep 2007

Posts: 3,737

Likes: 179

From: Western Mass

Vacuum issue...
either pump is bad, or you have a massive leak somewhere.

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Old

May 8, 2017 | 08:59 AM

#3

cadunkle

Cargo Master

Joined: Oct 2005

Posts: 2,295

Likes: 25

From: NJ

How much vacuum is it pulling under these conditions before and after applying brakes? Compare to vacuum directly off the pump.

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