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Old 09-12-2011, 06:58 PM
LSO1123 LSO1123 is offline
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hard brake pedal

I'm having an issue with my brakes. Most of the time when I hit my brakes its like trying to mash a concrete block and has very little stopping ability. When the pedal actually feels normal, it stops better but not great by any means. I thought maybe it was my vacuum pump but I pulled the main vacuum line and it seems to have good suction. I have new calipers and pads on the front and I bled the lines until there were no bubbles. I have no idea about the rear drum brakes as to how old they are. I'm thinking a master cylinder or booster problem or maybe both? Any other suggestions?
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Old 09-12-2011, 08:16 PM
greywynd greywynd is offline
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When it's hard most/all of the time like that, it's generally either vacuum or booster. I've also learned that anytime I replace a booster now, I replace the master cylinder at the same time, as often there are issues there as well. (Often a seal in the master is starting to leak, the fluid kills the booster diaphragm.)
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Old 09-12-2011, 08:26 PM
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Same thing with me, it was my vacuum pump. The pump should be pulling at least 19 on the gauge.
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1992 Ford F-250 XLT 7.3 IDI 115K, 4X4, ZF5 S5-47 w/ 12inch clutch and SMF, Banks wastegated sidewinder turbo, 6637, BB injectors, rebuilt IP w/ fuel turned up, 3 inch DP, custom 3.5 inch exhaust with 4 inch tailpipe, 285/75/16R Yokohama's on PSD alcoas. Rebuilt D60 w/ firestone airbags. 10.25 sterling rear w/4:10's LS, Three pillar gauges with pyrometer, boost, and transmission temperature. Onboard air w/ 400C Viair. 16K rated B&W trailer hitch. Sound-tracker CB w/ 4 ft firestik.
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Old 09-12-2011, 08:59 PM
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Sounds like lack of vacuum from dead/dying vacuum pump.
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1990 Ford F250 4x4, ZF5, L/S 4.10, N/A 7.3L Diesel, 568,808km/377,497 miles, still on the original clutch!
1989 Ford F150 300-6, C6, 2.73, 135,000km/84,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 277,000km/173,000 miles.
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Old 09-12-2011, 09:15 PM
LSO1123 LSO1123 is offline
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I was thinking vacuum pump but someone suggested pulling the main vacuum line to see if it sucked to my finger pretty good and it did so then I began to have doubts. What kind of gauge can I test it with?
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Old 09-12-2011, 09:16 PM
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Any vacuum gauge will do.
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1990 Ford F250 4x4, ZF5, L/S 4.10, N/A 7.3L Diesel, 568,808km/377,497 miles, still on the original clutch!
1989 Ford F150 300-6, C6, 2.73, 135,000km/84,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 277,000km/173,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 670,000km/419k miles
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Old 09-12-2011, 09:23 PM
LSO1123 LSO1123 is offline
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cool, thanks
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Old 09-13-2011, 11:27 AM
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Eric Steller
Brake Light possibly caused by dieing vacumm pump - Oilburners.net
Read my thread ^^^^^

My vac pump would easily pull 25 inhg at idle even right before it died.
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Myth: An IDI is slow going up hills.
Fact: It's slow going down the hills as well.
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Old 09-13-2011, 12:40 PM
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While we are on the subject, my brakes are stiff if I hit the pedal fast but if I slowly depress it, the brakes are soft and the pedal travels further. Is this vacuum related?

Someone cut me off the other day and I was surprised when I stomped the brakes and nothing really happened. They didn't seem to move from the hard position, ie: they didn't suck down or at least not quickly.
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Old 09-13-2011, 02:02 PM
Marianna2003 Marianna2003 is offline
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Time for a hydroboost!
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Old 09-13-2011, 03:15 PM
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Quote:
Originally Posted by Marianna2003 View Post
Time for a hydroboost!
I would love to but the wallet won't agree with me on it. I think I need new brakes anyway, I get a squeak/squeal every time I apply the brakes.

F250 hydroboosted his brakes and he seems to like it.
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Old 09-13-2011, 03:17 PM
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He also says that they feel like manual brakes, I like my vacuum brakes sorry.
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1992 Ford F-250 XLT 7.3 IDI 115K, 4X4, ZF5 S5-47 w/ 12inch clutch and SMF, Banks wastegated sidewinder turbo, 6637, BB injectors, rebuilt IP w/ fuel turned up, 3 inch DP, custom 3.5 inch exhaust with 4 inch tailpipe, 285/75/16R Yokohama's on PSD alcoas. Rebuilt D60 w/ firestone airbags. 10.25 sterling rear w/4:10's LS, Three pillar gauges with pyrometer, boost, and transmission temperature. Onboard air w/ 400C Viair. 16K rated B&W trailer hitch. Sound-tracker CB w/ 4 ft firestik.
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Old 09-13-2011, 05:45 PM
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there's no comparison in the braking power.
if you want to stop without the mushy brakes,that's the cure all.
iv got a hard pedal cus i haven't swapped to the f-super duty pedal yet.i dunno where to buy one.

LSO,if you find out you need a vacuum booster send me a pm if you don't mind a used one (under 80k miles.)
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Old 09-13-2011, 11:22 PM
LSO1123 LSO1123 is offline
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Well I checked the vacuum pump with a vacuum tester and its only drawing around 10 lbs. Sometimes it'll jump up to 15 but never any more. Guess its time for a new vacuum pump? Thanks 250, I'll send u a pm when I get back to a computer, can't figure out how to do it on my phone.
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Old 09-13-2011, 11:58 PM
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I swapped in a junkyard Hydroboost setup, using all my original brake parts, and the pedal isn't hard at all. Feels much better than the stock setup (before it went out). Best upgrade I've done so far.
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Old 09-13-2011, 11:58 PM
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