I replace my brake lines today along with 2 remanufactured front calipers. Then went through the process of bleeding my brakes. I couldnt get anything to bleed from the rears or the passenger front side. It bleed fine from the drivers front though. Not sure where start in diagnosing this?
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brakes wont bleed??
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brakes wont bleed??
Renting my rear wheel bearing tool kit. SIR
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Are you using the pedal method, or a pressure bleeder? Either can work, though the pressure bleeder is going to be easier.
If the fluid drained out of the lines when you were changing parts, there may just be a lot of air in the lines and it will take a lot of pedal pumps to push it out.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, AL
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I replaced my master cylinder and had issues bleeding. I doubt the previous owner(s) ever flushed the fluid. I took rear calipers off, disassembled them and the fluid was the consistency of Hersey syrup. The orifice that the bleed screw opens was totally clogged. I needed a small piece of wire to unclog it. Open the brake line to the caliper and see if fluid comes out.sigpic
Steve Corbett
1983 528E Scrapped
1983 528E Sold
1984 745I
1984 325E - Sold
1989 325I Bronzit-Sold
1989 325I Zinno
1988 635CSI
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so tried bleeding brakes again today. Replaced the slave/master/all brake lines/both front calipers.
Used a pressure bleeder but couldnt bleed from the passenger front. ? Also the brake pedal feels like theres air in the system. How do I go about troubleshooting?Renting my rear wheel bearing tool kit. SIR
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pump the piss out of them. till it feels solid, open the left front. repeat, switch with your friend frequently to prevent leg cramps
sigpic1984 318i Total conversion to a DIRT race car.
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There is a pro portioning valve under the car the splits the fluid to both rear wheels that can get clogged.Alex 88 m5 | 91 318is | 19 Subaru Ascent
BMW Tool Rentals & Fender Roller
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Originally posted by ///M42 sport View Postso tried bleeding brakes again today. Replaced the slave/master/all brake lines/both front calipers.
Used a pressure bleeder but couldnt bleed from the passenger front. ? Also the brake pedal feels like theres air in the system. How do I go about troubleshooting?The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, AL
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if you didn't have a problem before changing the lines as mentioned above; chances are you just have way too much air in the lines. One way you can bleed the ABS is turn the car on and bleed the system that way. Furthest caliper from master to closest. The close off the system. top fluild up again and start over with the car off. the only way you would get a clog in the system if you had never changed the fluid and debris was left in the res. Since you replaced the master and bleed it you shouldn't have any blockages except maybe for a nipple opening.
You're gonna have to heman the brake pedal until you get flow. Good o'l fashioned way of bleeding the system never fails.
As mentioned also gravity bleed is also good. Crack open the nipples and walk away for a few hours. GL.sigpic
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Originally posted by Ceeker View Postif you didn't have a problem before changing the lines as mentioned above; chances are you just have way too much air in the lines. One way you can bleed the ABS is turn the car on and bleed the system that way. Furthest caliper from master to closest. The close off the system. top fluild up again and start over with the car off. the only way you would get a clog in the system if you had never changed the fluid and debris was left in the res. Since you replaced the master and bleed it you shouldn't have any blockages except maybe for a nipple opening.
In this case one front caliper will bleed, but the other won't. That says that the line for the front brakes to the ABS unit is okay. That leaves the ABS unit and the line from there to the caliper as possible suspects. A stuck valve in the ABS unit isn't an uncommon occurrence, especially if the brake system hasn't been maintained properly with fluid changes every other year.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, AL
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If it is the ABS stuck, can it just be cleaned out with brake cleaner?Renting my rear wheel bearing tool kit. SIR
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No, it's hydraulic pumps and valves. Brake cleaner is for brake debris, like brake debris and grease. For mechanical areas. I would suggest disconnecting lines/hoses before calipers to make sure you are getting fluid to certain points.Alex 88 m5 | 91 318is | 19 Subaru Ascent
BMW Tool Rentals & Fender Roller
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