Suddenly my brakes get really hard, not that often.
My 1997 expedition eddie bauer 5.4 has a trouble, sometimes when I push the brake pedal it become really hard and vibrate and the car do not brake at all, I need to release preassure and push it again and then it brake normally.
It has normal fluid level, everything seems ok but the cruise control deactivation swith has a little fluid stain and do not work.
The main issue is that sometimes the brakes surprise me because it does that just once in a while, I was thinking to replace the ABS sensors.
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I had this same problem (brake lights won't come on when pushing on brake) I found that the brake light sending unit had come out of adjustment.Look under the dash by the brake pedal.There is a plastic threaded unit that needs to be pushed back towards the brake pedal lever.Careful not to push it to far or the brake lights will stay on. Hope this helps
I had a similar problem when I owned a 1997 Expedition. In my case, the brake light switch, mounted to the brake pedal arm, was faulty. My guess is that you have a similar problem. Pretty easy to replace... couple of wires and a clip as I recall.
A vacuum leak. Look & listen for hissing noise where rubber or nylon lines come through firewall under dash near brake pedal. Also look under hood at large hose going to back of brake master cylinder, power brake booster.
It could be a number of things, the good news is that none of them are serious or expensive to fix.
The normal components that make up your brake circut are:
1. The brake light fuse (In the fuse box and labeled as such)
2. The brake light switch/relay - also called a stop light switch. It's under the dash, right behind the brake pedal arm. When you push the brake, it sends a signal to the lights which turns them on. Think of the dome light switch in the door jam of your truck. When you open the door, it releases the switch and your dome light pops on. Same thing with the brake light switch.
3. The bulbs in the tail lights and the 3rd brake light.
If none of them are working, it's most likely a fuse or the switch/relay under the dash. If it's the switch, it's a $12 part. Obviously fuses are only a couple bucks.
I think there are 2 switchs on that brake pedal. You are right tho about the brake switch causing your problem. If you fix your brake light problem your other problem will be fixed also.. check to see if the wires at the brake pedal switch are energized. I am betting on a ground problem.
disconnect the neg batt cable,loosen clamp and disconnect air cleaner outlet tube and resonator from the air cleaner. 2.disconnect maf sensor connector. 3.lift air cleaner assy from tray and position aside. 4. remove screws from power steering resevoir, and position aside. 5.disconnect brake fluid level sensor, and if equiped brake pressure switch. 6.remove the two mounting nuts holding master cylinder, position master cylinder aside (DO NOT LOOSEN LINES ON MASTER CYL). 7.remove mounting bolts for degas bottle and postion aside. 8.if equiped diconnect wiring at the pedal position sensor. 9.relaease clamp and disconnect hose. 10.remove the pin, washer, bushing and switch, disconnect pushrod. 11.remove the nuts and brake booster, to access nuts fold back sound insulation. reverse procedure to install.
the brake system on these units cant be bled at home if air gets into themaster cylinder and or the (hcu) hydraulic control unit,a special anti-lock brake test adapter has to be pluged into the control module, any atempt to bleed the system with out this tool wiil result in a spongy pedal