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I used to travel 500 Km to my native village with a fully loaded vehicle along with 5 person in my WagonR. I also used to cruise with speed in between 80 to 100 Km/hr but the vehicle braking decrease very much in respect to only travelling with 5 person with little baggage.

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Maruti or Sazuki? What year? –  Mark Johnson Oct 25 '12 at 15:36
    
@mark johnson It's Maruti Suzuki Year 2008 –  Namshum Oct 26 '12 at 13:05

4 Answers 4

Might need better tires, may need bigger brakes. Make sure you're using appropriate tires for the load and conditions. Consider trying better brake pads or possibly upgrading to a big brake kit. Perhaps better brake cooling (such as cool air ducts) would help.

First you're going to have to identify the weakest component in the list so that you can upgrade it.

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My current tyre size is 145/70R13, disk brakes in the front while drum in the rear. What will be the appropriate size of my car for the load of 5 adult and 80 KG baggage. Will all the changes hamper my car balance. Also kindly point me where might the brake cooling lies. –  Namshum Oct 26 '12 at 13:02
    
That's not a whole lot of tire for stopping with 5 people. I looked up "WagonR" on wikipedia and it appears that you may not have many options. It doesn't really seem to be designed with heavy loads in mind. Those small diameter wheels are going to restrict brake capacity and the narrowness of the wheels/tires is not going to allow for much traction anyways. –  Brian Knoblauch Oct 26 '12 at 14:37
    
So, what are the option left for me. –  Namshum Oct 26 '12 at 14:43
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@Namshum, I'd first look to see if you can swap the rear drum brakes for disc brakes, and see if you can find a slightly wider tire that fits. Also you can look at higher temp brake pad compounds as others have suggested. –  mac Oct 26 '12 at 16:22
    
@BrianKnoblauch Are front disk brake different from rear disk brake. I am questioning as I couldn't find any disk brake for my make, so I thought of buying the front disk and replace the rear drum. –  Namshum Oct 27 '12 at 5:55

Tires are going to be the biggest change you can implement. The widest, stickiest tires you can get for your conditions.

Typically, any car can lock its tires up under normal conditions (average load, speeds). If it can do this, the braking system is more than adequate, and the tires are the first thing you should change. Now, when you start upgrading tires, the braking system typically starts to fall behind. Then you can worry about upgrading other braking components.

If you have a heavy load, I'm betting your getting pretty good grip out of your tires, so getting better discs, calipers, etc. would be the next step. Unfortunately, this is an upgrade that's more aimed at racing enthusiasts, so finding parts suitable for street use might be difficult.

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There are a few things that you can do to gain better braking ability.

Upgrade your brake lines

Vehicles from factory usually come with stock rubber brake lines. Upgrading to stainless steel brake lines will lead to less 'gummy' feel when you step on the brakes. This also has the added effect of allowing more even pressure to be put on the brakes. Read this article and this wikipedia entry on braided stainless steel brake lines for more info.

Upgrade your brake pads

Upgrading from regular brake pads to track-style brake pads will greatly increase your braking performance. Track-style or racing brake pads usually tend to be louder under braking and tend to create a lot more brake dust, but provide amazing performance in comparison with stock brake pads.

Upgrade your brake fluid

Upgrading your brake fluid from regular brake fluid to racing or track-specific brake fluid will again increase your braking performance. I use Super Blue Racing Fluid in my car.

Upgrade your Rotors

Upgrade your rotors to slotted or drilled or slotted-and-drilled for increased performance. Also, the bigger the rotors, the bigger area the pads have to bite and the more easily heat is dissipated.

Upgrade your tires

Upgrade your tires from regular street tires to high-performance summer tires or high-performance all-season tires. Tires like Michelin Pilot Sport PS2, Ling Long L688, Nitto Invo, Yokohama S.Drive, Bridgestone Potenza RE760 Sport, Kumho Ecsta XS, etc are good tires with great bite.

Upgrade your driving style

Remember that with a higher load, your braking distance increases greatly.

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Racing/"high performance" parts are not necessarily appropriate here. High performance summer and high performance all season tires are not appropriate for all road conditions. True track/racing brake pads need to come up to temperature before they develop any "bite", and can be quite terrifying and dangerous when cold, definitely not appropriate for road-going vehicles. –  mac Oct 25 '12 at 20:30
    
High performance summer tires are not at all recommended in the rain / cold weather obviously. High performance all-season tires are what I use on my car and they are absolutely astounding compared to the cheapos the car came with. True track/racing brake pads do need to come up to temperature before they develop "bite" and yes, they can be terrifying and dangerous when cold - I know that firsthand. But when compared to stock pads, I'd rather have a terrifying first 10 minutes of driving than having to worry about not having a good brake system in case of emergencies. –  jsanc623 Oct 26 '12 at 16:08
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I strongly disagree about the true track pads. They should not be used on the street in any circumstance. It's not just the first 10 minutes of driving that can be terrifying, it's any time the pads cool--a few minutes of highway driving with no brake applications would be enough to make them have very little bite. They would then be very dangerous in an emergency. I don't think it's much of a concern for the OP, however, as brake pad selections for the Wagon R may be limited. Others reading this post should be advised, however. –  mac Oct 26 '12 at 16:26
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It really depends on the type of "track" pads. For example, I now street Porterfield R4-E pads. They bite better cold (even in the middle of Winter, tested by me down to -20F) than my stock pads ever did (and they'll tolerate MUCH higher temperatures as well). The downside to them is the cost, dust, and wear (they eat rotors like crazy). There's always some kind of tradeoff, but it's not always cold weather performance that suffers (sometimes it's just the wallet!). :-) –  Brian Knoblauch Oct 26 '12 at 16:48
    
I have to agree with both of you - mac you do make a point about "TRUE" track pads...and in light of that, I would suggest racing pads, etc. I experience the same as Brian does - much better performance over the stock pads both cold and hot. –  jsanc623 Oct 26 '12 at 17:19

If this is a vehicle that you just bought it is possible that the brakes just aren't as good as your previous vehicle. From the information I could get online, this vehicle is equipped with drum type rear brakes. The problem may be that they are not adjusted correctly. Although the front discs do the majority of the braking ,the rear brakes must be adjusted correctly to achieve maximum braking. To an extent the rears brakes are self adjusting. There are a variety of self adjuster types from different manufacturers. Some require that you drive in reverse and apply quick pumps to the brake pedal, other require setting the park brake several times. The best self adjusters are marginal at best. The best way is to periodically have them adjusted as part of routine service. If after verifying that the brakes are working correctly you are still dissatisfied with their performance you may want to look at upgrades. The original pads were installed as a compromise of cost, noise, durability and stopping power. To stop faster you will most likely give up one or more of these characteristics. They may not last as long, they may wear rotors faster or make more noise. They certainly will cost more. Vented and drilled rotors will give better brake performance but at an increase in cost. An alternative would be to use engine braking.

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