The truck has 315,000 miles on it but doesn't burn excessive oil. It has been well maintained. The brake peddle was soft and sometimes leaked down slowly before it got too hard to push with one foot. I replaced the vacumn pump but it is still too hard. What else should I do? It is a good truck and I would really like to get it going again. Thanks for any help you can give. Bill
2006-08-25 10:52:22 · 8 answers · asked by nimitmai 1 in Cars & Transportation ➔ Car Makes ➔ Ford
You need to replace the master cylinder that is in front of that vacuum pump you had just replaced. Personally, I would've done that master cylinder first, but you did your best. Hope this helps.
2006-08-25 10:57:50 · answer #1 · answered by Silverstang 7 · 0⤊ 0⤋
hurrah for intergalactic milage diesels! long may they run and break their odometers...
Don't know about your brake problem pal, but with such an essential system - that may well be totally rotten from age and many punishing miles on such a vehicle - especially with an enormously grunty engine such as that, I'd bite the expense bullet and take it to a professional garage for diagnosis and repair. Unless a ford pick guru comes along and spots it as a common, characteristic problem, there's not really much to go on there, and the risks involved in getting it wrong are much too great.
My best guess is that you've got air in the hydraulic system somewhere; that's usually what a "soft" pedal indicates; could be a leak in the lines or the master cylinder (along with the low fluid level that could result), or simply ancient brake fluid that's absorbed a lot of water and dissolvable air gasses.
(that's a second reason to take it to the garage, and maybe combine the two - if they haven't been looked at for a while - regardless of how well the other systems have been looked after - the fluid is probably long past it's best and in need of replacement, and i'm always happy to pay for someone else to struggle with rusted-tight bleed nipples and the inevitable, toxic mess that comes with mucking about with DOT-5)
As for the apparent lack of servo, perhaps the pump is good but the vac lines are rotten?
2006-08-25 18:01:37 · answer #2 · answered by markp 4 · 1⤊ 3⤋
Remove the vacuum hose off the brake booster with it running and put your thumb over the hose and see if it has a good suck to it. If it does then the brake booster is bad,most likely a vacuum leak inside of it.
2006-08-25 21:58:06 · answer #3 · answered by Josh S 7 · 1⤊ 1⤋
Might be the master cylinder. I would also make sure the rod between the vacuum pump and the master cyl. is not bent and is installed right. I have also seen it to be bad engine vacuum to the vacuum cyl. being too low. Good luck
2006-08-25 18:03:12 · answer #4 · answered by Jeep Driver 5 · 0⤊ 1⤋
Might be your rear brakes don't work. Sounds like vac. pump or brake booster. Need to put a vac. guage to see if you have enough vac. somewhere around 20.
2006-08-26 05:29:49 · answer #5 · answered by kayef57 5 · 1⤊ 1⤋
well if you replaced the vacumm booster with out replacing the master cylinder then more than likly ruined the booster and you will need to replace both as fluid from master cylinder will soften the diaphram in the booster and cause it to blow
2006-08-25 18:02:51 · answer #6 · answered by prospectorofgold 2 · 0⤊ 2⤋
replace the vacuum power booster ( that baig thing that ur master cylinder is bolted to) the diaphram ruptured
2006-08-25 18:53:03 · answer #7 · answered by plymouthfurysport68 3 · 1⤊ 1⤋
bleed brakes fill fluid resevoir with proper fluid pump brakes till pedal wont go down any more drive and see if that works
2006-08-25 18:05:58 · answer #8 · answered by jmhslh110 3 · 0⤊ 2⤋