Brake Bleeding Sequence?? - Defender Source
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  #1  
Old April 9th, 2009, 08:42 AM
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Angry Brake Bleeding Sequence??

Is there a sequence to bleeding the brakes on a NAS 90 ? I have bled many brakes in the past and I am having a problem with the SW's brakes. I started from a completely empty system. I bled them and now the brakes work but you basically 2 feet to push the pedal down... Would there still be air in them? Any Ideas?

By the way, the truck has all new SS flex lines and new pads and rotors.
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  #2  
Old April 9th, 2009, 09:14 AM
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rear passenger, rear driver, front passenger front driver
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Old April 9th, 2009, 10:04 AM
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i agree w/ Jimmy. The FSM says to start furthest away from the master cylinder in the bleeding sequence... i've heard that makes a world of difference.
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Old April 9th, 2009, 10:30 AM
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I thought it was rear driver, then rear passenger. I thought rear driver side was farthest away.
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  #5  
Old April 9th, 2009, 10:47 AM
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me too, rear driver is further because the brake line goes across the axle.
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Old April 9th, 2009, 10:51 AM
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That's right. I guess that would make sense.
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  #7  
Old April 9th, 2009, 12:09 PM
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Randy, 2 feet to push the pedal down doesn't sound like a problem with air in the lines to me. If you had air in the lines you'd feel a spongy pedal wouldn't you?
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Old April 9th, 2009, 12:37 PM
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thats what I thought with the air.. What else would it be?
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Old April 9th, 2009, 12:41 PM
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Blocked line? I'd say stuck caliper piston but you didn't indicate you touched them although they could have gotten stuck if you pressed them in too far putting in the pads. But you can test for this. Pry the piston back, then press on the brakes and verify it moved (or look for a piston not pushed out maybe).
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Old April 9th, 2009, 12:53 PM
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HARD BRAKE PEDAL Lack of power assist may be due to low engine vacuum, a leaky vacuum hose or a defective booster. Sometimes a faulty check valve will allow vacuum to bleed out of the booster causing a hard pedal when the brakes are applied. This condition can be diagnosed by starting the engine (to build vacuum), shutting it off, waiting four or five minutes, then trying the brakes to see if there is power assist. No assist means a new check valve is needed.

A quick way to check the vacuum booster is to pump the brake pedal several times with the engine off to bleed off any vacuum that may still be in the unit. Then hold your foot on the pedal and start the engine. If the booster is working, the amount of effort required to hold the pedal should drop and the pedal itself may depress slightly. If nothing happens and the vacuum connections to the booster unit are okay, a new booster is needed (the vacuum hose should be replaced, too).

On vehicles equipped with "Hydroboost" power brakes, a hard pedal can be caused by a loose power steering pump belt, a low fluid level, leaks in the power hoses, or leaks or faulty valves in the hydroboost unit itself (the latter call for rebuilding or replacing the booster).
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  #11  
Old April 9th, 2009, 06:32 PM
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this is on a TDI truck Jimmy with a vacuum pump. I took the vacuum line off of the booster and there was vacuum.
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  #12  
Old April 9th, 2009, 09:44 PM
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This is right out of the manual:

Complete circuit bleed
1. Disconnect battery.
2. Bleed front calipers, driverís side first. Fit bleed
hose to bleed screw.
3. Dip free end of bleed hose into brake fluid in
bleed bottle.
4. Open bleed screw of caliper.
5. Depress brake pedal fully several times until fluid
is clear of air bubbles.
6. Keeping pedal fully depressed, tighten bleed
screw, then release pedal.
7. Repeat procedure on other front caliper followed
by rear calipers.
8. Fit all bleed screw protection caps.
9. Check/top-up fluid level when bleeding is
complete
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  #13  
Old April 9th, 2009, 09:48 PM
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10. reconnect battery
11. Fix your radio codes/presets/whatever
12. shake head and ask yourself wtf you had to disconnect the battery in the first place
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Old April 10th, 2009, 09:03 AM
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Its something in the vacuum side of the system. Few years ago I had this happen on the ambulance I was driving.
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Old April 10th, 2009, 09:18 AM
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Quote:
Originally Posted by flippedrover
Its something in the vacuum side of the system. Few years ago I had this happen on the ambulance I was driving.

maybe the vacuum pump on the tdi ?????
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  #16  
Old April 10th, 2009, 09:31 AM
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But you said you had vacuum. I don't know how much it should be, but seems thats an easy one to test right?
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  #17  
Old April 13th, 2009, 09:01 AM
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I'd think a leak somewhere in the line.
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Can't you feel 'em swimmin' around?
You got fins to the left, fins to the right,
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and you're the only girl in town.

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  #18  
Old April 13th, 2009, 09:34 AM
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Been a while since I've bled my brakes but how many valves are on each caliper? Made the mistake one of only bleeding the outer valves on the race car forgetting there were to valves on each caliper. Caused the same symptoms.
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  #19  
Old April 13th, 2009, 09:49 AM
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Should just be one.
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  #20  
Old April 14th, 2009, 12:19 AM
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I assume you bench bled the master?

Isnt there a proportioning valve on the RH side of the bulkhead?
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