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Brake pedal suddenly gets soft, and goes away. Tried

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bleeding, changing master cylinder, still...
Brake pedal suddenly gets soft, and goes away. Tried bleeding, changing master cylinder, still same problem
Submitted: 3 months ago.Category: Lexus
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Customer reply replied 3 months ago
Its on a 08 yaris with no abs. There are also no leaks.
Answered in 14 minutes by:
12/28/2017
Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago
David Craig
David Craig, Auto Mechanic
Category: Lexus
Satisfied Customers: 5,152
Experience: Owner/Mechanic at 3D Automotive
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Hi my name is ***** ***** I'll be more than happy to assist you, Please allow me a few minutes to review your information. Thank you.

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Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago

did you bench bleed the master cylinder before installing it?

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Customer reply replied 3 months ago
I have also tried 3 other master cylinders. The last one was an original advics unit. I only started getting a sudden soft pedal recently though, even with the new master cylinder. I put my old one back on.
Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago

do you happen to have an abs light on?

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Customer reply replied 3 months ago
no, this car has no abs module. Could it be the booster check valve?
Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago

it can be, but if you remove the check valve and are only able to blow through one side then its ok.

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Customer reply replied 3 months ago
the fluid was new. I bench bled the system and then bled it from the two front lines. This issue happens randomly. Air in the lines you would feel right away
Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago

with the vehicle off and you pump up the pedal do you have a good pedal?

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Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago

?

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Customer reply replied 3 months ago
Only thing is at times, rarely though, maybe every hundred or two hundred pumps I feel the pedal gets a little weaker like the brakes don't engage as well. Someone said it could be that I have a little front rotor run-out.
Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago

no, run out you would feel all the time.

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Customer reply replied 3 months ago
I feel the warpage at times but this car naturally has a lighter pedal. I would if it's normal I get the occasional somewhat spongy feel or not.
Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago

I wondering if the hoses are internally deteriorating a little.

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Customer reply replied 3 months ago
That is what I was thinking. How would u tell. Last time I checked about two months ago, I didn't see any buldges or real cracks
Customer reply replied 3 months ago
Or even less, probably around several weeks
Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago

you really cant. its a shot in the dark. sometimes the insides of the hoses peel away and pieces act like a check valve. theres no way to see that though

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Customer reply replied 3 months ago
you think it might be one of the rubber lines. Should I worry about taking the car out or no?
Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago

I do think it is. I would not worry about taking the car out. just replace the front 2 hoses as soon as you can

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Lexus Mechanic: David Craig, Auto Mechanic replied 3 months ago

Please note that customer satisfaction is my number one goal and rating this chat session 3 or more stars will be greatly appreciated and will allow any follow-up questions you may have. we can chat back and forth many times until the vehicle is fixed at no extra charges
Thank you for rating my assistance and for using Just Answer.

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