12-16-14, 11:57 AM
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Brake pedal hits the floor after brake pad change
11-01-16, 01:47 PM
#31
How-To Tuesday
Seems like a good topic for this week's How-To article...
https://www.clublexus.com/how-tos/a/...e-floor-363511
https://www.clublexus.com/how-tos/a/...e-floor-363511
11-07-16, 04:04 AM
#32
Driver School Candidate
Join Date: Jul 2013
Location: Mo
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Brakes slowly depressing to floor
Please do not change master cylinder, as I did and it didn't change anything. I had brakes inspected by A Lexus dealer. A ASE shop. And final check by a good mechanic shop.
I have replaced rotors, brakes pads twice. After I installed rotors brakes firmed up for 2 months. Afterwards same old mushy feeling. I call double pump, before I come to stop sign. The members on here have made suggestions. Caliper bolts, using only Lexus replacement parts. I have yet to rebuild calipers, purchased my 430 LS from McGrath Lexus. Chicago, my car had a hard winter life ? Bought 139.000. I have 145,000. Still drives nice. But brakes my main issue. I'm a Mo. Dealer. Thinking of selling. Already replaced timing belt, new $1700 chrome wheels, $400 tires. Brakes etc. $600.00. Still not happy. PS. I owned a 1996 LS 400 before. Love Lexus cars. Thanks Hojo
I have replaced rotors, brakes pads twice. After I installed rotors brakes firmed up for 2 months. Afterwards same old mushy feeling. I call double pump, before I come to stop sign. The members on here have made suggestions. Caliper bolts, using only Lexus replacement parts. I have yet to rebuild calipers, purchased my 430 LS from McGrath Lexus. Chicago, my car had a hard winter life ? Bought 139.000. I have 145,000. Still drives nice. But brakes my main issue. I'm a Mo. Dealer. Thinking of selling. Already replaced timing belt, new $1700 chrome wheels, $400 tires. Brakes etc. $600.00. Still not happy. PS. I owned a 1996 LS 400 before. Love Lexus cars. Thanks Hojo
11-07-16, 05:46 AM
#33
Lexus Fanatic
Again, I am most familiar with German cars, so forgive me if I'm off (one of my other forums will blast a person if they try to draw experiences from DIY on imports).
If this were a BMW, I'd be looking at the ABS/DSC hydro pump. I basically replaced my pads/rotors, then the ABS pump which failed. This was all time consuming and the car is not a DD, so after I finished replacing the ABS pump, fully knowing there was air in the system, I drove it. Yes, pedal went to the floor, but what I really wanted to do was to confirm that ABS now worked (warning lights gone after it reached x mph), and they did. Some DIY'ers say you can drive on gravel and slam on your brakes, activating ABS, then bleed normally, and you can get most of the air out. BUT, the factory says no. Whenever calipers are removed, ABS, master, blah blah blah, the vehicle MUST be bled normally, then using the automated procedure by which the software activates each channel of the ABS. Essentially, 2 bleeds, one normal, one by computer.
I saw the Lexus procedure posted and it's totally different, seemed that it was all done by foot, but there was a bleeder on the ABS. My hunch is there's air trapped. Also, my understanding is that you cannot simply use one's foot to get it out of the ABS system as the bubbles cling. But, maybe this doesn't apply to Japanese cars, not sure...
Good luck one wouldn't think it's unsolvable....
If this were a BMW, I'd be looking at the ABS/DSC hydro pump. I basically replaced my pads/rotors, then the ABS pump which failed. This was all time consuming and the car is not a DD, so after I finished replacing the ABS pump, fully knowing there was air in the system, I drove it. Yes, pedal went to the floor, but what I really wanted to do was to confirm that ABS now worked (warning lights gone after it reached x mph), and they did. Some DIY'ers say you can drive on gravel and slam on your brakes, activating ABS, then bleed normally, and you can get most of the air out. BUT, the factory says no. Whenever calipers are removed, ABS, master, blah blah blah, the vehicle MUST be bled normally, then using the automated procedure by which the software activates each channel of the ABS. Essentially, 2 bleeds, one normal, one by computer.
I saw the Lexus procedure posted and it's totally different, seemed that it was all done by foot, but there was a bleeder on the ABS. My hunch is there's air trapped. Also, my understanding is that you cannot simply use one's foot to get it out of the ABS system as the bubbles cling. But, maybe this doesn't apply to Japanese cars, not sure...
Good luck one wouldn't think it's unsolvable....
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