All break lines will come back to a master cylinder that helps control and apply the break pressure. A break in the line drains a good portion of this fluid plus puts air in the line. Basically the master cylinder is useless. Generally you would have mechanical breaks, not that it would help much with such a heavy truck, but it would be something. The issue is that the ABS system triggers and starts trying to pump the break pedal for you to prevent lockups.
I too had this happen! 45XX vin, Noticed a rattle on one side while on forest service road (benefits of EV off-roading). Had to use a temp screw until SC finally replaced with OEM...
I think I might practice using it a few times when the road behind me is clear. I am not sure my brain would tell me to use it in an emergent situation, though I might think about trying to throw it in park, so who knows.
Will that even work if the brake fluid is drained?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.
It does say "if the brakes don't work properly". I think it will engage the parking brake on the rear axle but I have yet to do this at all. If I were asked to implement it, it would be an all-hands-on-deck situation where every system is activated at once.
I haven't looked at the master cylinder of my R1T, but since the 1960's or earlier most automobile brake (not break) systems have employed dual reservoir master cylinders to prevent a rupture on any on brake line emptying the system of fluid thus still providing brakes to at least two wheels. In theory, if the left front brake hose ruptured, the right front and left rear brakes will still function in a "cross" style brake system.
Interesting. Guess I never paid that much attention when handling them. Rivian looks to be no different. An example can be looked at here https://www.ebay.com/itm/285773437334?chn=ps&mkevt=1&mkcid=28. I can only assume there is a separator in the middle. I am guessing that the rear brakes were functioning then. But with the smaller calipers and such a heavy vehicle they probably have pretty limited stopping potential. Thank you for the correction.
I used to build demolition derby cars and always removed the front calipers and cut the lines. The rear drums still worked fine. It was too easy to get the front wheels locked up by the calipers after all the side impacts.I haven't looked at the master cylinder of my R1T, but since the 1960's or earlier most automobile brake (not break) systems have employed dual reservoir master cylinders to prevent a rupture on any on brake line emptying the system of fluid thus still providing brakes to at least two wheels. In theory, if the left front brake hose ruptured, the right front and left rear brakes will still function in a "cross" style brake system.
Usually its one diagonal pair - aka one front and the diagnonal opposite rear. So if one line was leaking, you would still get one front and one rear brake functional, just on opposite sides to minimize pulling to one side.
1. I can ask the Denver SC what they have seen. They have been pretty honest about what issues they see frequently.
It should not be an if you are going to peek under truck. Everyone should get in the habit of raising the suspension once in a while and crawling under their vehicle to check for loose bolts or damage.
Agree. The consequence of failing to maintain your vehicle could be death.
