Brakes have failed😟 FIXED!!

[EODguy]

Originally Posted by X5only

I sure hope it is the vacuum pump that has failed because it’s very easy to replace or repair. I’ve done it a couple of times in the past. Is there a way ro tell if it’s the culprit?

Well, as for how to usually tell...

Your symptoms mirror what mine were and you even said it made a noise (yours=whooshing, mine=gurgling) and these are all listed as vacuum pump failure symptoms.

I'm not saying that those things are solely indicators for the vacuum pump as they can also be from a master cylinder.

I can't guarantee that I'm correct, but if I were in your situation I would swap vacuum pumps without a doubt.
The benefit is if it's the pump you are one and done, and if not you will finish with a completely new top end of your brakes done (after new fluid & bleeding)...


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[TsO346]

I know you said your brake fluid level has remained full but I had the same symptoms where the pedal went to the floor and would get a faint whooshing sound while pumping the pedal but for me it was a ruptured rear brake line under the running board area. I had a shop replace the line, they did both since the other line under there wasn’t looking to healthy. Had to have someone else bleed the brakes though because the abs pump went dry and the shop didn’t have the software to properly activate the abs pump. So as long as your abs pump hasn’t gone dry, bleeding shouldn’t be an issue. I was with the guy that had the Ista program and brake bleeding was hell, took long ass time! I also replaced the booster and mc just in case a seal or diaphragm got messed up. Wasn’t too bad of a diy, just have to remove the wiper arms, cowl and wiper pump.. no way it was gonna come out without removing those items.

[X5only]

Indy determined it's the brake booster. All other components of the brake system checked out fine. Diagnosis cost $187. Plan is to refresh the brake system as the components are all original.

[80stech]

I think if the seal in the vacuum pump isn't working properly it can let some crankcase fumes into the booster and shorten the life on that which is why I think you guys with the V-8s seem to have more booster issues so you might want to check that too. I have a hard time believing that a ruptured diaphragm in the brake booster can cause the pedal going to the floor but if you are replacing the master cylinder too then you have that covered.

[X5only]

Originally Posted by 80stech

I think if the seal in the vacuum pump isn't working properly it can let some crankcase fumes into the booster and shorten the life on that which is why I think you guys with the V-8s seem to have more booster issues so you might want to check that too. I have a hard time believing that a ruptured diaphragm in the brake booster can cause the pedal going to the floor but if you are replacing the master cylinder too then you have that covered.

Yeah, the brake light switch, vacuum pump, brake booster and master cylinder are getting replaced. I let the Indy do all the work as I just hate dealing with complicated brake bleeding. I used to get intermittent brake light switch errors now and then, so having that replaced too.

[X5only]

My X5 is whole again . The brakes are as sharp as ever and the pedal feels solid I think the braking system will be ok for the next eon.