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nacradriver
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PostPosted: Tue Apr 26, 2016 2:26 pm    Post subject: Name That Repair Reply with quote

Have this leak that I'll be looking after soon and want to get an idea on what to be looking for once I get into it...

Not the caliper as there is no leaking on the backside, and the brake pedal is firm. It is only on the left front wheel.... thinking the dust cap may be craped out... suggestions?


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PostPosted: Tue Apr 26, 2016 2:34 pm    Post subject: Re: Name That Repair Reply with quote

I'd pull the wheel right quick and look.

A front wheel bearing that fails at speed simply ain't no fun!

But yes, the grease spewed out screams "PROBLEM HERE!!!"

The front left wheel has a square hole in the beating cap for the speedometer, but even if it is rounded or missing the cable....... it shouldn't spew grease like that.

Dave
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Christopher Schimke
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PostPosted: Tue Apr 26, 2016 3:10 pm    Post subject: Re: Name That Repair Reply with quote

When the hub gets hot, the grease thins out and this allows it to creep out of the crevices around the grease cap and it gets slung outward.

Many times this will happen when the rotor gets really hot due to a dragging caliper or sometimes even when there is a long, downhill event that required lots of braking. Obviously the wheel bearings could be the culprit too.
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dhaavers
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PostPosted: Tue Apr 26, 2016 4:27 pm    Post subject: Re: Name That Repair Reply with quote

Another vote for bearing grease. Something's getting hot down in that corner...check it out, SOON.

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nacradriver
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PostPosted: Tue Apr 26, 2016 6:05 pm    Post subject: Re: Name That Repair Reply with quote

Christopher Schimke wrote:
When the hub gets hot, the grease thins out and this allows it to creep out of the crevices around the grease cap and it gets slung outward.

Many times this will happen when the rotor gets really hot due to a dragging caliper or sometimes even when there is a long, downhill event that required lots of braking. Obviously the wheel bearings could be the culprit too.


Thanks Christopher... what would cause a caliper to drag...
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Merian
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PostPosted: Tue Apr 26, 2016 6:13 pm    Post subject: Re: Name That Repair Reply with quote

if someone has not changed the rubber brake hoses, they can swell shut, preventing the piston from moving back

or any of a dozen other possibilities

anyway, you want to put it up on stands while you do ALL brake maintenance and wheel bearing maintenance - do all 4 wheels
- how long since the wheel bearings were inspected and re-greased?
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dobryan
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PostPosted: Tue Apr 26, 2016 6:33 pm    Post subject: Re: Name That Repair Reply with quote

I have had the bearing grease flung out like that before. Never found a cause but obviously heat is involved to thin it out enough to creep like that. Many tens of thousands of miles later it has stopped and no issues. Bearings are fine. Never did pin point the issue. 😕😕
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T3 Pilot
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PostPosted: Tue Apr 26, 2016 6:38 pm    Post subject: Re: Name That Repair Reply with quote

nacradriver wrote:
Christopher Schimke wrote:
When the hub gets hot, the grease thins out and this allows it to creep out of the crevices around the grease cap and it gets slung outward.

Many times this will happen when the rotor gets really hot due to a dragging caliper or sometimes even when there is a long, downhill event that required lots of braking. Obviously the wheel bearings could be the culprit too.


Thanks Christopher... what would cause a caliper to drag...


The caliber guide pins need some Silicone grease and confirm that their respective boots are in good condition.
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Howesight
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PostPosted: Tue Apr 26, 2016 7:04 pm    Post subject: Re: Name That Repair Reply with quote

Years ago, a local cat sprayed my custom wheel rims several days in a row. Since cat pee is the same colour and viscosity as brake fluid, I thought I knew what to do. Fortunately, before removing the wheel to check the brake hoses and caliper, I sniffed the "brake" fluid.

Bingo - - it was Felix at work.
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chase4food
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PostPosted: Tue Apr 26, 2016 8:05 pm    Post subject: Re: Name That Repair Reply with quote

nacradriver wrote:

Thanks Christopher... what would cause a caliper to drag...


What Christopher most likely meant is the brake pad are dragging excessively as if you have the brake applied a bit while driving. There are a few common causes:

For fixed caliper like the earlier Vanagon with dual pistons. After a incomplete rebuild, one or both the pistons may not slide smoothly, typically due to rusted pistons with the vehicle in the rust belt, or just simply too old and rusty. This prevents the piston from retracting slightly when there is no hydraulic pressure.

On floating caliper, like the one on later Vanagon, rust can cause the floating caliper to no longer float on the sliders. This will cause excessive brake drag. Of course the piston is susceptible to seizure just as the fixed caliper if the piston is rusty.

I have seen both of these two causes.

When there is excessive rust on the brake pad cavity of the caliper, that too can cause the pad not to retract and hence excessive drag.
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Michael4104
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PostPosted: Tue Apr 26, 2016 9:16 pm    Post subject: Re: Name That Repair Reply with quote

Another vote for pulling the wheel and have a look.
I doubt there's a rust problems in Ventura ca., but stickie pins can happen.
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