Brake Fluid Flush Due At 30,000 Miles, ...anyone have theirs done yet? Options

[RX400h]

I noticed this while scanning the owner's manual, the other day, and I now have 33,000 miles on my RX, putting it past the recommended 30,000 miles for a brake fluid flush. While I used to flush brake fluid, years ago, I now leave that up to the pros. I'm just wondering what the cost will be. I also noticed that long life coolant isn't recommended to be changed for many, many miles. Personally, I don't think I want to wait more than 5 years.

Thoughts?

[silvercorvette]

The TV mechanic on the show (I think it is ) "Motorweek) explained that it is important to flush the fluid because the fluid absorbs moisture ["hygroscopic,"].

When I first started driving no one that I know bothered with that stuff but I guess we have learned more about how cars work over the years.

That said I usually don't keep a car long enough to wear out the tires or battery but I do have two cars that I do intend of flushing out when I get the chance.

I bought a 62 Vette a few years ago that is in good condition but I intend on going over it from top to bottom and make it like new, and the 96 that I bought new has sat in storage in my garage while I was busy moving all over the country.

I just moved from NY to Anderson SC last August and just added a second two car garage and work shop. I am waiting for my lift that I ordered to arrive and when it does I definitely will flush the brakes. I have done brakes jobs in the past (come to think of it I haven't had a car long enough to wear out the brakes in a while) and bleed out the air after the break job. I doubt that it will be any harder to flush the system than it is to bleed the air you just use more fluid and make sure you do it in the proper order starting with the wheel closes to the master cylinder and working your way out.


If you intend on doing it yourself the money you save will more than pay for the cost of this tool



Here is a good article explaining why fluid should be changed

[katzjamr]

thank you for the brake fluid article, i am one of those who also never changed the brake fluid on my trucks, unless the brakes are in for service. I didnt let them do the $120 brake flush at the 30,000 mile service because i really didnt think it was necessary. I will have the fluid changed completely when the front brakes are in for service. I am at 36000 miles now and i dont think the brakes are going to make it to the 60 or 80 K we once hoped because of the type of system that is on the hybrid. Personally i am more concerned that the oil in the transmission be changed before 100K even though it is synthetic.

[BobBass]

Regardless of what it costs to flush to brakes, keep in mind that it might be the ONLY money you spend on the braking system. Some reviews of hybrids have projected brake pads/discs to last the LIFE OF THE VEHICLE! Can't complain about that.

[silvercorvette]

Regardless of what it costs to flush to brakes, keep in mind that it might be the ONLY money you spend on the braking system. Some reviews of hybrids have projected brake pads/discs to last the LIFE OF THE VEHICLE! Can't complain about that.

A lot depends on your driving habits. I seem to be able to make my brakes last forever even on normal cars before I started driving hybrids but I have always had the habit of watching the traffic and lights ahead and taking my foot of the gas long before I intend to stop. But I have been a passenger in many cars where the driver leaves their foot on the gas when the light ahead is red without even attempting to glide up to the light. Then at the last second with a few feet from the light they hit the brake hard. These people will burn through brakes reguardless of if they drive a regenerative braking system or not. The whole key to regen braking is a light touch on the pedal to allow the generator slow the car without the brake pads coming into play. If you put light pressure on the pedal almost 100% of the stopping will be accomplished by regen braking but if there is no anticipation and you hit the brakes hard at evey stop almost all the stopping will be by the brake pads. I have noticed a big diffrence in the regen braking between the RX400H (All wheel drive) and the GS450H. The RX did not slow down very much when you took your foot off the gas, but the GS regen kicks right in, it almost feels as if you downshifted to a lower gear the moment your foot comes off the gas. My guess is that with the more aggressive regen programing the brake pads won't really get much use at all [unless you had poor driving habits].

There is a long hill with a gradual down hill slope on the way to my house. With the RX I was able to turn on to the street at about 20 MPH and coast all the way to the bottom of the hill. But if I do the same thing with the GS I have to use a little battery power less than half way down the hill in order for me to get to the bottom. I guess for some reason the felt it was better to program more aggressive regen into the GS

[Gryphon]

I may be inept, but I have never liked the MityVac much for my cars or motorcycles, and actually gave mine away recently in lieu of more conventional bleeding methods. One that works pretty well is to force the brake fluid up from the calipers with a well-fitted syringe.

Now here comes the teasing...another method that I recently used on my Porsche 968, a rather difficult vehicle to bleed, is what I might call the successive dilution method. Brake fluid is quite cheap so I simply suck out as much fluid as possible from the master cylinder and refill it with fresh fluid, then drive the vehicle for a day, and do it again (and again). After about 6 drain/fills the fluid looks fresh and new.

Tom

[katzjamr]

Regardless of what it costs to flush to brakes, keep in mind that it might be the ONLY money you spend on the braking system. Some reviews of hybrids have projected brake pads/discs to last the LIFE OF THE VEHICLE! Can't complain about that.

i hear what your are saying, however based on t he wear measurements the 'technicians' take during my oil changes my brakes on the 400h are not going to make it to 60 or 80, more like 50K or less so it seems to me i will have the fluid changed at that time. i didnt see a reason for a $600 service bill at the dealer for the 30K visit. So i asked them to do what TOYOTA required at 30K and it came to $225.00 plus tax. They were not insistent on the brake service at all, only suggested it and i get the feeling most of their customers dont question their advice.

[silvercorvette]

I may be inept, but I have never liked the MityVac much for my cars or motorcycles, and actually gave mine away recently in lieu of more conventional bleeding methods. One that works pretty well is to force the brake fluid up from the calipers with a well-fitted syringe.

Now here comes the teasing...another method that I recently used on my Porsche 968, a rather difficult vehicle to bleed, is what I might call the successive dilution method. Brake fluid is quite cheap so I simply suck out as much fluid as possible from the master cylinder and refill it with fresh fluid, then drive the vehicle for a day, and do it again (and again). After about 6 drain/fills the fluid looks fresh and new.

Tom

I have been working on cars for over 40 years both as a hobby and as a way of earning extra money to add to my real job pay check. And since I work alone in my garage with no extra foot to pump the pedal the Mity Vac is indispensable. I doubt that the fluid near the pads is clean. Try bleeding some out and check how clean it looks, I it will not be as clean as it is in the fluid master cylinder. I haven't worked on cars in a long time and I truly love getting dirty working on cars. That is why I can't wait to get my work shop set up in my new garage in my new house

[RX400h]

Thanks for the links, Silver and everyone else for your comments.

I too, have done plenty of brake jobs on my 68 Corvette, from installing brake lines and calipers to a complete silicone fluid replacement. I've flushed by gravity, Mity-Vac, and venturi vacuum pump that used compressed air to generate vacuum. None worked as well as a professional pressure bleeder, but the nice apart about this ultimately messy job was that the silicone fluid was harmless to my painted garage floor, my hands, and the car. Maybe if I were retired and had tons of time n my hands, I'd buy one of those pressure bleeders, but right now, with work and other hobbies, I'll leave it up to the dealership.

By the way, Car & Driver estimated RX400h brake pad life at over 100,000 miles. I think the key to long life (as Silver mentioned) is to use momentum that our 4600 lb vehicle has. I coast as often as possible - it makes it easy to justify rocketing past those X5s and Cayennes!

Dave

[SOMEONE ELSE...]

From the dealer's hybrid specialist (though this flatly contradicts the 'overkill' maintenance scheduel) ... off the record, but still, from one who is as 'in-the-know' as one can possibly be:

http://priuschat.com/forums/care-maintenan...-you-don-t.html

So if you ARE paranoid, or have cash to throw around you can ... but it's nice to know you don't have to.

[RX400h]

Thanks for the info!

[Gryphon]

Brake fluid, other than DOT5, is hygroscopic (absorbs water), and as such should definitely be changed on some sort of reasonable schedule, to avoid degradation of materials it is in contact with.

Tom

[RX400h]

The comments in the link included this:

(PS to those of you worried about rusting... the calipers are aluminum body construction with a composite plastic piston.)

Still, aluminum can corrode if it had not been treated or had been insufficiently treated. Also, I'm not certain if the brake lines are stainless steel. I've never seen any corrode enough to leak, even in Connecticut.

I may have my brake fluid replaced once during the warranty period, primarily as added insurance.

[silvercorvette]

Also if you do a lot of hard braking, [racing on the track or long descents down high steep mountain roads] the fluid temp can get very high, the water can boil and turn to steam. When that happens you can lose most if not all of the ability to brake.

[SOMEONE ELSE...]

Also if you do a lot of hard braking, [racing on the track or long descents down high steep mountain roads] the fluid temp can get very high, the water can boil and turn to steam. When that happens you can lose most if not all of the ability to brake.

Hugh? Brake fluid turn to steam? Brake fluid is oil ... so, no steam