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Ford F-Series Braking Questions

26 messages,  Last post on Aug 18, 2008 at 3:12 PM

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#17 of 26 1976 F150 4x4 brakes won't release by braski Jul 05, 2007 (5:53 pm)
I have a 1976 ford F150 4x4 with vacuum assist:Front brakes will not relieve pressure after braking. I have replaced calipers, master cylinder, and front lines. I'm stumped and would appreciate any help. Replies to this message: wpalkowski (Jul 06, 2007 4:29 am)
#18 of 26 Re: 1976 F150 4x4 brakes won't release [braski] by wpalkowski Jul 06, 2007 (4:29 am)
Replying to: braski (Jul 05, 2007 5:53 pm) Did you change out the brake hoses too? I had a similar problem on a '73 Econoline van - turned out that the inside of the brake hose was disintegrating and a chunk of rubber acted as a one-way valve on brake fluid. You could apply the brakes, but then it took like 3-4 minutes before the caliper would release. New hoses, no problem. Just my $0.02.
#19 of 26 REB by rbrant Oct 18, 2007 (8:11 am)
Hi. My 2005 F 150 with 22,000 miles had a constant squeel in the brakes. The dealer turned the rotors and the pads are about 80% of the new ones. The squeeling in the brakes has returned but not as bad as before. Any suggestions?   Reb
#20 of 26 ABS light stays on by bassman45 Oct 18, 2007 (10:50 am)
The ABS light on my '99 stays on all the time now. Before, it was just intermittent. My mechanic says that there is a bad sensor in the differential and there is absolutely no safety issue. Another guy told me that if the light is on, the ABS system is not working (obviously a safety issue).   While I've only got about 60K miles on it, I've just had the rotors replaced, after haveing them turned twice.   Anyone have any advice?   Thanks. Replies to this message: chucklem (Nov 23, 2007 6:47 pm) mickeymouse2 (Dec 11, 2007 9:05 pm)
#21 of 26 BRAKE LIGHTS by chucklem Nov 23, 2007 (2:26 pm)
I have an 06 F150 with ~20K miles with no problems of any kind. On recent trip was on road for ~6 hrs. When taking exit ramp I MAY (can't remember for sure) have TAPPED (not more) brake pedal. Suddenly (1) warning buzzer went off and at the same time (2) ABS light illuminated and (3) TCS light illuminated. I was on exit ramp so checked for brakes - - normal braking. ABS and TCS lights remained illuminated (steady). Drove home shut down and unpacked. Restarted truck to park it - - ABS light on steady and TCS light OFF. Checked several days later ABS light on steady, TCS light OFF. Any suggestions? Speed sensor?
#22 of 26 Re: ABS light stays on [bassman45] by chucklem Nov 23, 2007 (6:47 pm)
Replying to: bassman45 (Oct 18, 2007 10:50 am) The ABS light on my '99 stays on all the time now. Before, it was just intermittent. My mechanic says that there is a bad sensor in the differential and there is absolutely no safety issue. Another guy told me that if the light is on, the ABS system is not working (obviously a safety issue). The bad sensor call is likely correct. If so, you don't have ABS. You DO have normal braking (probably why the mechanic says "no safety issue") You have to decide how badly you want ABS.   While I've only got about 60K miles on it, I've just had the rotors replaced, after haveing them turned twice. Not common for any truck I've heard of. Were the pads gone? That said, I don't know (1) driving habits (2) operating conditions or (3) what kind of loads you're carrying. Could be a combination of all. Non-negative Fact: Some people wear out brakes (and vehicles) faster than others.
#23 of 26 Brake Pedal Travel Distance and a HISS sound by cayadopi Dec 10, 2007 (2:40 am)
'92, F350, dually, 141,000. Has belt driven type assist.   I know that a slight hiss when pressing brake is normal and has to do with something called a brake assist.   Prior to my last brake job at the Ford dealer, the hiss was short in duration, and when depressing the brake pedal, the normal travel distance before braking was approximately 2".   After last brake job at the dealer (master cyclinder, calipers, drums/discs resurface, and adjust rea brake regulators), the hiss sound was much longer in duration, and the pedal travel increased to 4 1/2" (i.e. nearly to the floor starting from 6"). Ford has maintained nothing wrong. Wrong - it has been downright scary to have to press the brake pedal that far. (They system has been bled numerous times with no change - even immediately after bleeding.)   I have since replace the MC with a MC with a larger (bore?). The brake pedal travel is now 3" (getting closer to the way it was before).   Does anyone know 1) what would cause a longer hissing sound, and 2) is this related to a longer brake pedal travel distance?   Thanks guys. Female needs help !! Replies to this message: mickeymouse2 (Dec 11, 2007 10:13 pm)
#24 of 26 Re: ABS light stays on [bassman45] by mickeymouse2 Dec 11, 2007 (9:05 pm)
Replying to: bassman45 (Oct 18, 2007 10:50 am) If the sensor in the differential is bad, just replace it. It's not expensive nor is it difficult to replace. Its held in with one 10mm bolt located on top of the differential above the drive shaft area. When your ABS light is on, it just means that your onboard computer has dedected a problem and disabled the ABS only. You still have reagular power brakes. Technically, I guess it is a safety issue, but not much of one.
#25 of 26 Re: Brake Pedal Travel Distance and a HISS sound [cayadopi] by mickeymouse2 Dec 11, 2007 (10:13 pm)
Replying to: cayadopi (Dec 10, 2007 2:40 am) Does anyone know 1) what would cause a longer hissing sound, and 2) is this related to a longer brake pedal travel distance? Yes & Yes   The longer hissing sound is caused by the hydralic assist to have to either work harder or longer to push on the Master cylinder to pressurise the brake system.   Lets assume for the moment that there is no new problem with the assist part of the system. You didn't have this problem until the brakes were done. Right? This symptom is telling me that there is a lack of restriction in the hydrallic brake lines somewhere, such as ; incorrect brake calipers or incorrect rear wheel cylinders(for regular power brakes lets say) or in some cases there is an ajustment rod with a backwards threaded bolt coming out of the assist,(not all models). This adjustment is critical for proper braking. Very unlikly this rod if your truck has it is causing this symptom. If I had to take a guess without inspecting the brakes on this vehicle, my money is on incorrect calipers or wheel cylinders. Here is my explanation that would have to be researched and inspected on your truck. Sometimes calipers and wheel cylinders for a regular power brake system and a hydralic assist look the same, but the chambers or cavities inside them are different sizes. This means they require different amounts of hydralic pressure from the master cylinder. You need a very experienced technician to check this for you. And yes, the Dealer does make mistakes. I fix one of their screw ups at least once a month. Good luck!
#26 of 26 f-150 brake bleeding by troscoeb Aug 18, 2008 (3:12 pm)
can anyone tell me the order you need to bleed the brakes after changing pads.i know it has to be done in a specific order but i dont know it. i have a 2004 f-150. help would be greatly appreciated

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