F53 brake master cylinder failure

[MetalGator]

The last couple of trips I have noticed that I had oily water under the front drivers side of my 2018 Miramar motorhome. The only time I didn't see a small puddle was when I didn't use the AC on one trip.

The motorhome is still under warranty (Ford) until June so I took it to a large Ford truck dealership that's nearby. I called today to get a status and the service rep said they were waiting on a part, some type of cylinder. I am assuming he was referring to the brake master cylinder as that is where I suspected the leak was coming from.

I think the condensation from running the AC was washing off some of the fluid that was leaking from the cylinder and that was what I was seeing as the puddle under the drivers side.

I only have a little over 11K miles on the motorhome. Is this type of failure common on the F53 chases? I haven't seen much mention of master cylinder failures on the F53 so I am hoping this is an isolated incident.

Burch

[MetalGator]

Chum lee wrote:
Only use the specified brake fluid if you need to top off. (see your owners manual or the reservoir on the MC)

Chum lee

I would think you would need some type of pump to fill the bin. The master cylinder is high up in the compartment and right under the dashboard. Barely enough room to take the cap off.

I will report back once I get the motorhome back and talk to the service writer. He did tell me this was covered by the Ford warranty.

[Chum_lee]

MetalGator wrote:
The motorhome is still under warranty (Ford) until June so I took it to a large Ford truck dealership that's nearby. I called today to get a status and the service rep said they were waiting on a part, some type of cylinder. I am assuming he was referring to the brake master cylinder.

I only have a little over 11K miles on the motorhome. Is this type of failure common on the F53 chases? I haven't seen much mention of master cylinder failures on the F53 so I am hoping this is an isolated incident.

Burch

IMO, chances are it IS an isolated incident. At the age/mileage of your motorhome, it is not a common failure, but, it does happen. Watch the brake fluid level in the master cylinder in the future. It should go down slowly over time as the brake pads wear, but it should never go below the "MIN" level between brake pad changes. Only use the specified brake fluid if you need to top off. (see your owners manual or the reservoir on the MC)

Chum lee

[Yankee_Clipper]

I'm on my second F53 rig, and I have not heard of master cylinder failures before. Usually wheel cylinders will fail first, or the brake media will need to be replaced(rotors/pads). If the master cylinder were to fail, I'd expect you'd have a YIKES moment that would leave no doubt what had happened.
Good luck working this out. I'll be curious to see what Ford has to say.

[MetalGator]

RLS7201 wrote:
Right and left side of vehicles are referenced like you are sitting in the driver's seat.
That puts the master cylinder on the front left side.

Richard

If that is the case, yes it would be on the front left. I referenced the leak as being on the drivers side on my first post.

Just curious if anyone has had this issue with the F53 before.

[RLS7201]

MetalGator wrote:
The brake cylinder is on the front right. It's way up in the engine compartment. I don't see how you could even add fluid to it as there is really no room above it. Underneath the master cylinder looks like the power steering. Under that is the windshield washer fluid tank. The washer fluid tank had a film of oily/water solution on it after my last trip. The fluid got on part of the frame of the motorhome and the black paint is starting to bubble. I have been told that brake fluid will do this to paint.

Right and left side of vehicles are referenced like you are sitting in the driver's seat.
That puts the master cylinder on the front left side.

Richard

[MetalGator]

The brake cylinder is on the front right. It's way up in the engine compartment. I don't see how you could even add fluid to it as there is really no room above it. Underneath the master cylinder looks like the power steering. Under that is the windshield washer fluid tank. The washer fluid tank had a film of oily/water solution on it after my last trip. The fluid got on part of the frame of the motorhome and the black paint is starting to bubble. I have been told that brake fluid will do this to paint.

[wolfe10]

Interesting. Normally, the dash A/C condensate drain is on the RIGHT side of the front, brake master cylinder/hydraulic booster on the LEFT.

Did you look under it to locate the source?