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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?
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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2001 F250 Superduty, 6.8V10, 2WD, auto. The 'family' truck.
1991 F350 4x4 E40D, N/A 7.3 Diesel, SRW, Crewcab, now with Meyer plow.
1990(?) F350 4x4, E40D, N/A 7.3 Diesel, with Meyer poly plow, needs a body swap.
1991 F250 4x4, E40D, N/A 7.3 Diesel, 'the runaway'
1989 F350 2wd C6 N/A 7.3 Diesel Dually w/flatbed dump, retired with a broken frame rail.
1988 F250 4x4 C6 N/A 6.9 Diesel, parts truck
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, 127,000km/79,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 265,000km/166,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 658,000km/411k miles
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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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, 127,000km/79,000 miles.
1987 Ford E350 26ft. Motorhome, N/A 6.9L Diesel, C6, 3.54, 265,000km/166,000 miles.
1985 Ford E350 Ext Van, 6.9L Diesel, C6, 4.11, 658,000km/411k miles
My vac pump would easily pull 25 inhg at idle even right before it died.
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Eric S.
1994 Ford F-250, SCLB, 7.3L IDI Factory Turbo, 2WD, E4OD, 4.10 LS.
ARP Head Studs, 60-1 Cold wheel, R&D IDI Performance 90cc DB2, Superduty e-fuel, AEM Dryflow, home made 3" exhaust outlet, 4"exhaust, some gauges(7)
Quote:
Originally Posted by RacinNdrummin
I still stand by the dodge comment... no DB pump is going to turdcloud as bad as a dodge....
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.
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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'93 BRG/BLK F250HD XLT 4x4 1st Gen Navistar 444ci Diesel w/ Intercooled 2nd Gen Banks Sidewinder Turbo, Built E40D, Hydroboost Brakes, Dually, Dump, & Plow
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.
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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