New brakes I think I need

[Danb]

Ok I know I need brakes maybe, it’s been about 5-6 years, just put on new tires and the brakes need quite a bit of pressure to stop the rascal and the parking brake doesn’t hold on runup, since new tires were installed( not really bad but preventative) could something be messed up since the tires were just changed or a coincidence?

[Boilermonkey]

Wow. We replace ours every other year if not every year.

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[Shadrach]

29 minutes ago, Boilermonkey said:

Wow. We replace ours every other year if not every year.

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Brakes every other year? Are you based at a 1500' strip?

[Shadrach]

@Danb Your mx professional will be able to tell how much friction material is left on the pads. The thing is, if the pads are worn to the point of being ineffective, you may have bigger problems.  I am wondering if something else isn't causing problems.

[Boilermonkey]

Nope...three owners....lots of time.

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[Yetti]

Get a flashlight and camera phone.  The pads are easier to see from the rear.     Easy to replace with 3 tools and 30 minutes.  The better question is how old is your brake fluid?

[Marauder]

Dan - your Bravo will have the calipers flipped and it should be pretty easy to see your pad conditions. Here is what you are looking for. You’re looking for the thickness of the things with red dots on them (I put red dots on my photo).



I hope this brake thing isn’t spreading like the measles. I am close to calling my brakes back to normal. Still had to do some more bleeding to stiffen them up some.


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[Danb]

Thanks this just started, seems when you have n annual or something done other things seem to occur 

[Marauder]

Thanks this just started, seems when you have n annual or something done other things seem to occur 

Of course it does!


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[Yetti]

Wear indicators

[FloridaMan]

On 1/8/2019 at 9:06 PM, Boilermonkey said:

Nope...three owners....lots of time.

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I did pads twice on my M20F over 1100 hours and I operate out of a short strip with regards to brakes being relatively inexpensive. Almost sounds like someone is taxiing with their feet heavy on the brakes. Do you have an owner that has flat spotted more tires than anyone else?

[Hank]

On 1/8/2019 at 7:25 PM, Boilermonkey said:

Wow. We replace ours every other year if not every year.

OMG!! I'm in my 12th year of ownership and have put hundreds of landings on my C at my home fields of 3000' over the trees and now 3200'. Neither brakes nor tires were new when I bought her, but I replaced the mains about 4-5 years ago and the nose most recently at annual last year. Call it 700+ hours on the tach, more in my logbook, and I haven't replaced the brakes yet . . .

What are ya'll doing? My final approach speed is 85 mph, slowing to 75 mph near the runway (there's no fence to come over), minus another 5 mph for every 300 lb below gross for that landing. When I land, I raise flaps after the nose comes down, and brake gently after IAS falls below 50 mph on rollout. So far, so good, but beginning to plan and look for brake pads.

[Guest]

Minimum pad thickness for organic linings is 0.100”.  The newer linings have the wear indicator as shown above.

Clarence

[jaylw314]

5 minutes ago, M20Doc said:

Minimum pad thickness for organic linings is 0.100”.  The newer linings have the wear indicator as shown above.

Clarence

What does the wear indicator look like?  I'm not sure what I'm looking at in @Yetti's photo other than his forehead

[Guest]

1 minute ago, jaylw314 said:

What does the wear indicator look like?  I'm not sure what I'm looking at in @Yetti's photo other than his forehead

There is a small indentation on the lining, against the disc.  I’ll get a picture later today.

Clarence

[jaylw314]

2 minutes ago, M20Doc said:

There is a small indentation on the lining, against the disc.  I’ll get a picture later today.

Clarence

I think I see that.  But it seems to go all the way up to the backing plate, how does it tell you when to change the pad?

[Guest]

3 minutes ago, jaylw314 said:

I think I see that.  But it seems to go all the way up to the backing plate, how does it tell you when to change the pad?

When the indicator disappears, the lining is worn to the rivets.

Clarence

[Yetti]

[jaylw314]

3 minutes ago, Yetti said:

I guess it sort of looks like the indicator goes all the way to the metal backing pad, but I might be seeing it wrong.

[Yetti]

These are pretty new pads and the wear indicator only goes about half way.    There has to be some pad material for the rivets.

[Guest]

Here is the lining on its own.

[PT20J]

All this wear indicator discussion is interesting, and certainly pads should be replaced when indicated by wear indicator or thickness measurement, but don’t pads generally continue to provide braking until worn to metal contact? The original post was regarding poor braking after wheel maintenance. 

[thinwing]

Back to the lack of braking....if pads checkout,its time to top off brake fluid reservoir and bleed out the old orange looking semi gelled fluid till it goes to bright red...Bravos are tough on brakes

[jaylw314]

1 hour ago, M20Doc said:

Here is the lining on its own.

Ooooh, okay, that's what I thought.  @Yetti's pic looks like the indentation goes all the way down, but it must just be a trick of the light.

[Guest]

It is possible that something was assembled incorrectly, the lining faces may have been contaminated during reassembly.  There are 2 different types of brakes installed on Bravo airframes, single and dual pistons.  The linings may need to be reconditioned.

Clarence