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Brake Failure and Axle Boot Tear

Tmac

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Generally not sure if these are related to one another, but noticed the boot because of the break issue.

The Quick: Woke up this morning, hopped in the truck and noticed my break went straight to the floor. Once at its bottom out position it triggered ABS and the thing went nuts. Didnt think much of it till I started going out of the neighborhood and noticed I had almost no break feel through the pedal. Hard to notice because I have regen on high so I dropped it to low and disabled break assist in the settings. Went to stop and nothing. Went right back to the house hopped out and noticed a trail up the driveway and then a puddle under the passenger front tire. Look under and it is just coated in grease from the axle. Needless to say the truck is being towed to the nearest SC. Stay tuned for the exciting episode of why cant my 7000LB truck stop.

The Details: I wanted to separate the detailed sections for those who dont care much about the nuance about why this may have happened. Ive had the truck for a bit over a year now and have worked real hard at putting 47,000 miles on it. I'm in the Colorado area and do a ton of commuting and mountain driving. Coming back from the resort yesterday I started to noticed my break acting weird but still had plenty of stopping power. So I wasnt concerned about it. I did notice that ABS kept triggering and thought it just needed a reset. Parked it in the garage and started charging to go back up the mountains the next day. Got in this morning and the break felt like it wasnt attached to anything. Pulled out the drive way and because of the one foot driving thought everything was ok. Pulled out of my neighborhood and when I went to stop from around 50MPH just nothing. Just bouncing around due to abs. So I crawled it to a park-n-ride lot and drove in a circle trying to see if I actually had breaks. I did but barely. I did a full vehicle reset and now the break light sticks on. Regen saved my butt here as it made it much less sketchy to get back to the house. Although I almost backed into my garage wall. There are no warning lights, although the red Break light is still stuck on. After calling customer service for a tow I noticed the trail of oil up and down the drive. Then noticed it under my front tire.

Now this is where I am not sure what is what. The axle boot is obviously split and grease is everywhere. But the oil on the ground is much lighter. I am not sure if there is a break oil leak somewhere and the axle boot is secondary or if they have caused one another. Only time will tell. On the not bright side all rental places are closed so Ill have to handle all of this in the morning.

What are yalls thoughts?

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Update: The SC has dug into the truck and confirmed what we have all talked about here. The bracket obviously was hanging from its normal position after the retaining bolt backed itself out. The are repairing this all under warranty thankfully. From the call they will replacing axel out right as well as the brake line and wheel speed sensor. They will also inspect all other components on that side and replace as needed.

So, If you have not check these bolts. As mentioned by some of the community below this is likely a good item to add to a regular checklist. Additionally, not all braking force is lost. Because of the split reservoir used by the system 1 front break and a rear should still be working. Holding down the parking button should also engage the brakes as well. Also regen can help. Ill keep everyone posted of full parts and repair brake down soon. Waiting on parts but should have the truck within a weeks time, hopefully.
Rivian R1T R1S Brake Failure and Axle Boot Tear 20240421_081951


Rivian R1T R1S Brake Failure and Axle Boot Tear 20240421_082048


Rivian R1T R1S Brake Failure and Axle Boot Tear 20240421_082232
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mikehmb

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My name is Mike, and I have a (car) problem
Brake fluid is relatively clear. It’s difficult to see with the mess that your CV joint made as to what other leaks may be in there.

If some debris/etc managed to slice your CV it may also have damaged your brake line.
 

electruck

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Hard to tell from pictures but I'm not sure either problem caused the other. I might suspect something got kicked up off the road and damaged both the boot and a brake line.
 

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This bracket came loose. Can't really suggest how it happened. Probably not the first one to have it occur.
Rivian R1T R1S Brake Failure and Axle Boot Tear 1000003124
 
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Tmac

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This bracket came loose. Can't really suggest how it happened. Probably not the first one to have it occur.

Interesting. Ill have to compare the other side to get a better idea what is right. Thank you for the picture. Its interesting to me that the regen can cover some of the symptoms compared to traditional cars. Might need a way to let a driver know you have no break fluid.
 

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Yea Looks like the brake line and bracket chewed through the drive boot and both leaked.
 

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This bracket came loose. Can't really suggest how it happened. Probably not the first one to have it occur.
1000003124.jpg
@Tmac what's your VIN? I have a 2022 32xx VIN with 44k miles and had that bracket come loose at 37k. I only noticed during a post off-road adventure wheel well spray-down, like shook loose by the bumpy road. I zip tied both sides and removed the opposite to get measurements to buy a temporary bolt until Rivian service could replace it a month later. After replacement, I kept the zip ties and tightened them. Fool me once, and all...

I smell a possible recall on this silly-ass undertorqued bolt.
 

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Did both front CV boots split? Did both front brake line brackets come loose? Or was it one side only. Curious as to this theory of a loose bracket chewing up the cv boot.
 
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Tmac

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@Riviot I have a lower serial, 08XX. And this may have come of quite some time ago. If this is the aftermath I would hope a recall is made. The regen is the only thing that stopped the truck. Can pull an e-break like my older cars.

@CANCERDOC Not sure. The truck got towed this morning. Ill ask the SC to check both sides to make sure its good. Gonna ad some zipties like Riviot has done to make sure it doesnt happen again.
 

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@Riviot I have a lower serial, 08XX. And this may have come of quite some time ago. If this is the aftermath I would hope a recall is made. The regen is the only thing that stopped the truck. Can pull an e-break like my older cars.

@CANCERDOC Not sure. The truck got towed this morning. Ill ask the SC to check both sides to make sure its good. Gonna ad some zipties like Riviot has done to make sure it doesnt happen again.
Don't forget that you also have the option of holding down the parking button for an emergency stop. I know it's hard to remember it when you've never had to use it before.

Rivian R1T R1S Brake Failure and Axle Boot Tear 1713792637133-4r
 

Quick

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Rivian doesn't use it, at least for this bolt, hence my reuse of zip ties as a security blanket.
We've had a couple of these failures reported on the forums recently. My new truck is coming on Friday. Makes me want to pull those bolts and loc-tite them myself.
 

Nacho Rivian

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Generally not sure if these are related to one another, but noticed the boot because of the break issue.

The Quick: Woke up this morning, hopped in the truck and noticed my break went straight to the floor. Once at its bottom out position it triggered ABS and the thing went nuts. Didnt think much of it till I started going out of the neighborhood and noticed I had almost no break feel through the pedal. Hard to notice because I have regen on high so I dropped it to low and disabled break assist in the settings. Went to stop and nothing. Went right back to the house hopped out and noticed a trail up the driveway and then a puddle under the passenger front tire. Look under and it is just coated in grease from the axle. Needless to say the truck is being towed to the nearest SC. Stay tuned for the exciting episode of why cant my 7000LB truck stop.

The Details: I wanted to separate the detailed sections for those who dont care much about the nuance about why this may have happened. Ive had the truck for a bit over a year now and have worked real hard at putting 47,000 miles on it. I'm in the Colorado area and do a ton of commuting and mountain driving. Coming back from the resort yesterday I started to noticed my break acting weird but still had plenty of stopping power. So I wasnt concerned about it. I did notice that ABS kept triggering and thought it just needed a reset. Parked it in the garage and started charging to go back up the mountains the next day. Got in this morning and the break felt like it wasnt attached to anything. Pulled out the drive way and because of the one foot driving thought everything was ok. Pulled out of my neighborhood and when I went to stop from around 50MPH just nothing. Just bouncing around due to abs. So I crawled it to a park-n-ride lot and drove in a circle trying to see if I actually had breaks. I did but barely. I did a full vehicle reset and now the break light sticks on. Regen saved my butt here as it made it much less sketchy to get back to the house. Although I almost backed into my garage wall. There are no warning lights, although the red Break light is still stuck on. After calling customer service for a tow I noticed the trail of oil up and down the drive. Then noticed it under my front tire.

Now this is where I am not sure what is what. The axle boot is obviously split and grease is everywhere. But the oil on the ground is much lighter. I am not sure if there is a break oil leak somewhere and the axle boot is secondary or if they have caused one another. Only time will tell. On the not bright side all rental places are closed so Ill have to handle all of this in the morning.

What are yalls thoughts?

20240421_081951.jpg


20240421_082048.jpg


20240421_082232.jpg
Wow… 47,000 miles on mountain road in CO… very impressive…. It seems your R did very well… but the time has come…. Hope your repair bill is not too steep..
 

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@Riviot I have a lower serial, 08XX. And this may have come of quite some time ago. If this is the aftermath I would hope a recall is made. The regen is the only thing that stopped the truck. Can pull an e-break like my older cars.
@Riviot I have a lower serial, 08XX. And this may have come of quite some time ago. If this is the aftermath I would hope a recall is made. The regen is the only thing that stopped the truck. Can pull an e-break like my older cars.

@CANCERDOC Not sure. The truck got towed this morning. Ill ask the SC to check both sides to make sure its good. Gonna ad some zipties like Riviot has done to make sure it doesnt happen again.
@CANCERDOC Not sure. The truck got towed this morning. Ill ask the SC to check both sides to make sure its good. Gonna ad some zipties like Riviot has done to make sure it doesnt happen again.
Please let us know what the SC says and does. Very scary.
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