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Symptoms of faulty brake master cylinder & booster?

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Old 02-07-10, 02:38 PM   #1
SorrGwa
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Default Symptoms of faulty brake master cylinder & booster?

Ok, i bought the brake master cylinder rebuild kit from sewell, swapped it in, but now seems that it didnt solve the problem or even made it worse. i think my brake booster is busted.

Here's the symptoms, with engine off, the brake pedal builds stiffness after 5 pumps, turn on engine, and the brake pedal sinks to the floor. with engine on, i pump the brake pedal several times only to have it sink to the floor. after 1 long press, or 2, i hear the buzzing sound of the booster turning on.

i have bleed the brakes 4 times, traditional method, new method, and twice over. went thru 2L of brake fluid.

took the car out for a spin, got about 20ft and noticed my brakes barely work, and the pedal sinks to the floor. checked the calipers they are moving no issue.

The question i have is,

Do they sell the brake booster seperately? how does it look like? and if not, where can i purchase a brake master cylinder. I know its sunday thus all dealers are closed. i figure i would ask clublexus first.

How much am i looking for?

Other than sewell, since when i use their online system, it just directs me to a rebuild kit (which i bought and didnt work), is there anywhere else i can buy oem parts online?

Thanx for all your help. just one big headache right now.
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Old 02-07-10, 02:58 PM   #2
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The master cylinder is an all in one unit, meaning it has the Abs computer, booster, pump, etc. These things are expensive as hell.

I need to change mine out cuz it makes the horrible scretching noise every single time I press the brakes. It still works good but it is annoying to have make that loud noise.

Is it easy to swap out the unit? Don't know if I should attemp swap it myself.
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Old 02-07-10, 03:33 PM   #3
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well, ill put it this way, i took the whole unit apart before realizing all u needed to do was remove the dust shield that protects the brake piston on the brake master cylinder.

the unit which i assume looks like a big pop can, must be the booster. it has 1 hard line attached to it, 1 rubber hose, and what looks like a positive and negative terminal.

is it easy to remove? relatively, its held in place with 3 or 4 hex bolts (u need an allen key to remove them)

the hardest part was removing the brake master cylinder/booster. under the dash there are 4 12mm nuts.

you need to disconenct the brake light sensor, the pin and cogger pin that holds the brake master cylinder piston to the brake pedal, and a spring that holds and pulls the brake pedal upward. after u remove these, u need to unscrew the 4 hard lines that run to the brake master cylinder/booster unit. you will also need to unplug 5-6 plugs, if i remember right there are 4 to one side, and 2 facing forward. they all are different sizes and so u cant really screw up putting them back in place.
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Old 02-07-10, 03:45 PM   #4
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A brand unit is crazy expensive. It'll run in the neighborhood of $1500 or so.

You're better off finding a used one that still functions. I know a few CL member here had done the same and it cost them about $400 for the unit. I wish Toyota would have separated the components instead.
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Old 02-07-10, 03:58 PM   #5
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its just confusing.

i did a search for "online lexus parts"

and found these 2 links

"brake booster"
http://www.trademotion.com/partlocat...99&catalogid=1

"master cylinder"
http://www.trademotion.com/partlocat...99&catalogid=1

way different on prices...
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Old 02-07-10, 04:16 PM   #6
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U should ring up Carson Toyota tomorrow and see how much the master cylinder is from them. There's also a few of them used on eBay.

Last edited by rgarjr; 02-07-10 at 04:19 PM..
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Old 02-07-10, 04:20 PM   #7
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yeah, and thanx for the pm. im looking at my options right now.

but basically a wasteful weekend. was all happy about getting the ls400 calipers on! then the passenger busts a leak, now my master brake clyinder is crapped out.

and i think my battery is dying, haha, so im charging it right now.
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Old 02-07-10, 05:35 PM   #8
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same thing happened to me when i did my ls upgrade but it ended up that a rear line burst replaced rear lines bleed the lines again now everything is fine... cleans14 when he did his motor swap he also swaped out the booster to a manuel supra booster and master cylinder i have been thinking of this route just because i am worried about the 1500 dollar replacement when this one goes out.
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Old 02-07-10, 10:42 PM   #9
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These things should be recalled from Lexus. They shouldn't fail that soon, especially when it's a 2,000 dollar part.
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Old 02-08-10, 07:05 AM   #10
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errr, mine isnt soon

i have like 160,000 miles on my GS.
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Old 02-08-10, 12:04 PM   #11
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Well u have been lucky I suppose.
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Old 02-08-10, 07:19 PM   #12
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i guess i should be lucky that this failed now and not on the road going 80mph...
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Old 02-08-10, 10:20 PM   #13
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Have u called Carson Toyota and see how much this part is from them? Might call them tomorrow.
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Old 02-09-10, 06:40 AM   #14
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either way, i called sewell lexus. carson lexus probably wont be as far off.

im getting a used one off of a gs400. hope it works!
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Old 02-10-10, 02:56 AM   #15
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hope this helps...bought a spare unit from yahoo japan for USD200 for my toyota aristo
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1999, 2004, booster, boster, brake, cylinder, fail, faulty, gs400, lexus, master, problems, pump, rx330master, signs, vacuum

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