Brake question no. 2
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More Turbo
Joined: Dec 2003
Posts: 571
Likes: 4
From: hondo
Brake question no. 2
Gentlemen,
Due to my brakes feelings spongy I replaced the back calipers with new ones and replaced on front caliper and new pads. All looked good and I started to bleed brakes. As I started to bleed I realized that I had not toped off the reservoir. When I checked it it was drained (dam it) . Just got I a hurry and missed it. Any way I topped it off and started to bleed. When all was done my brake pedal fell to the floor. I ran almost 3 qts of fluid and still pedal to the floor. So I took it to a local shop that said they can bleed the abs module. Which they did. still not resistance on pedal. They have check my work and bled the lines again with no luck. What do you think? master cylinder? new abs module? The mechanic and I are stumped. As always any advice is appreciated.
Due to my brakes feelings spongy I replaced the back calipers with new ones and replaced on front caliper and new pads. All looked good and I started to bleed brakes. As I started to bleed I realized that I had not toped off the reservoir. When I checked it it was drained (dam it) . Just got I a hurry and missed it. Any way I topped it off and started to bleed. When all was done my brake pedal fell to the floor. I ran almost 3 qts of fluid and still pedal to the floor. So I took it to a local shop that said they can bleed the abs module. Which they did. still not resistance on pedal. They have check my work and bled the lines again with no luck. What do you think? master cylinder? new abs module? The mechanic and I are stumped. As always any advice is appreciated.
Hotshot
Joined: Dec 2014
Posts: 17,828
Likes: 3,113
From: Jersey Shore
A good mechanic shouldn't be stumped.
A drained master will get air into the ABS, and that can be a challenge unless you have the right equipment to activate all the ABS functions, pump, reservoir, and valves. IDS of course, but so can Forscan and AE. And sometimes even with the right tool it still can be hard to rectify.
The other issue you can have with a drained M/C is if with a master that's been in service you pushed the pedal to the floor. This moves the M/C piston seals into the back area of the cylinders that are normally not traveled, and they tend to develop corrosion if the brake fluid was not changed on a routine basis. The seals will develop tears or nips and you can develop a seal, the seal is bypassing fluid and the pedal goes to the floor. Sometimes if the seal is rolling over its lip and fast, hard push gets it to seal, but it's still trashed.
So you can bleed through 5 gallons of fluid, still, it won't repair the damaged seal.
A drained master will get air into the ABS, and that can be a challenge unless you have the right equipment to activate all the ABS functions, pump, reservoir, and valves. IDS of course, but so can Forscan and AE. And sometimes even with the right tool it still can be hard to rectify.
The other issue you can have with a drained M/C is if with a master that's been in service you pushed the pedal to the floor. This moves the M/C piston seals into the back area of the cylinders that are normally not traveled, and they tend to develop corrosion if the brake fluid was not changed on a routine basis. The seals will develop tears or nips and you can develop a seal, the seal is bypassing fluid and the pedal goes to the floor. Sometimes if the seal is rolling over its lip and fast, hard push gets it to seal, but it's still trashed.
So you can bleed through 5 gallons of fluid, still, it won't repair the damaged seal.
Fleet Mechanic
Joined: Oct 2012
Posts: 1,558
Likes: 26
From: Bay Area
Jack, you mentioned it to me when I installed new calipers in the rear of my van and discovered the eBay shipper sent me 2 rear right calipers!
Hotshot
Joined: Dec 2014
Posts: 17,828
Likes: 3,113
From: Jersey Shore
It's like 1 time out of 10 I mention it.
It's something I just take for granted as brakes were my career, that its a known item. But for the DIY'er with a brake job every 5 years it's an easy miss, and I often blow right past that. I've gone deep into a discussion of trying to solve PTF and then realize the person on the other side may not have seen the issue.
Frustrating to me.
It's something I just take for granted as brakes were my career, that its a known item. But for the DIY'er with a brake job every 5 years it's an easy miss, and I often blow right past that. I've gone deep into a discussion of trying to solve PTF and then realize the person on the other side may not have seen the issue.
Frustrating to me.
More Turbo
Joined: Jan 2017
Posts: 709
Likes: 61
It's like 1 time out of 10 I mention it.
It's something I just take for granted as brakes were my career, that its a known item. But for the DIY'er with a brake job every 5 years it's an easy miss, and I often blow right past that. I've gone deep into a discussion of trying to solve PTF and then realize the person on the other side may not have seen the issue.
Frustrating to me.
It's something I just take for granted as brakes were my career, that its a known item. But for the DIY'er with a brake job every 5 years it's an easy miss, and I often blow right past that. I've gone deep into a discussion of trying to solve PTF and then realize the person on the other side may not have seen the issue.
Frustrating to me.
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Hotshot
Joined: Dec 2014
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From: Jersey Shore
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